Understanding John Titor
You will hear people who haven't researched Titor's story well claim it to be a hoax, but to this day it remains internally consistent and 'undebunked'. Start with the premise of multiple worlds theory being true -- that would mean that we live in a probabilistic universe in which some things are more changeable than others. The laws of physics for example might actually vary across widely disparate probabilistic universes, but not any of the universes that our own could ever evolve into. So the physical operation of Titor's time machine is not likely to vary from our worldline compared to the one that Titor claimed to grow up in. Nor would you expect major social trends and world events to vary greatly from one nearby worldline to the next, like the assaults upon the American Constitution we have witnessed over Bush's eight or so years and the apathy of most Americans toward those assaults, or the nonexistence of WMDs in Iraq. It would take a VERY LARGE DIVERGENCE between worldlines to make those kinds of things turn out different from one to the next.
What CAN easily change between nearby worldlines however are details about some of Titor's predictions like the dates and intensity of civil war he described, date the LHC would come online, and the date of global nuclear war. These are all easily modifiable by human intention and should not be expected to remain the same from one worldline to another ESPECIALLY in the case where you have a reasonably intelligent psychopath like Karl Rove whose plans may have been modified as a result of Titor revealing them to us, thereby GREATLY CHANGING OUR WORLDLINE. It is true that Titor didn't think we would change our worldline, but then again he was pretty cynical about the sheeplike apathy of contemporary Americans of his worldline and ours during the timeframe he was here. But he was just a soldier, not a prophet, and time travel would still be pretty new in only two and a half decades. It would therefore be wrong to consider him infallible, and people also forget that he didn't care whether we believed him or not! Titor explained that we could change our worldline if we wanted to badly enough, and Titor's story remains consistent with DETAILS actually changing while MAJOR things would not, and have not.
It is true that the Bush attacks upon our Constitution never sparked overt civil war, but it should be understood unambiguously that American freedoms were indeed under attack, that civil war could have easily broken out if Bush had pushed things far enough, and that many minor conflicts that had the potential to escalate were filtered out from the public consciousness by a compliant news media failing to report them. He never used the domestic relocation camps FEMA operates for example, whereas in Titor's original worldline they may have been used for the internment of Americans under the guise of imprisoning 'domestic terrorists' and we certainly came very close to accusations of 'domestic terrorists' in our worldline. That is all it would have taken to cause our timeline to diverge significantly from Titor's, pulling back just enough to stop the overt civil war. But anyone who doubts that our civil liberties were under attack and actually compromised by the Bush administration hasn't been paying attention very well. Titor's predictions about that were spot on, and nobody could have reasonably envisioned that in 2000 or 2001. That is validation no skeptic can deny.
John Titor told us our timeline could be changed
Similarly, the LONG delay in starting the LHC could easily have been manufactured so that the pre-warned governments would have the opportunity to research Titor's claims out of the public eye, remember how Titor indicated that governments would be very threatened by the prospect of time travel? The logical thing is that Titor's warnings to us were picked up by the very types of people that in his worldline did all the evil things he described, but in our worldline they had to go undercover so as to not be perceived as precisely following Titor's predictions. Consequently it is stupid and wrong to quibble over details AS IF there was no such thing as multiple universes, AS IF the smaller things couldn't be deliberately altered. We are only left in a state of uncertainty over small details today, while the bulk of the evidence, the major events not likely to be easily changed between worldlines, do support Titor as genuine.
Titor indicated that the next President would continue the policies of the former (Bush Jr. we now know) and while being well-meaning, would not change the direction of anything. That description exactly fits McCain and MAY fit Obama, but probably not; we are going to find out in the next few years by how aggressive and successful Obama turns out to be in stabilizing American and world financial markets and international tensions. The most likely situation which fits the evidence best is that McCain won the last election in Titor's worldline, he just kept on doing the same stupid warmongering that Bush did, and consequently there was nuclear war in 2015. But in our worldline enough of us were warned by Titor to make a difference -- the online world is much more powerful than most people realize yet -- and combined with the bad guys pulling back the police state to deliberately avoid Titor's predictions we have instead elected a much smarter and more capable President that is quite hard to imagine following in Bush's footsteps like McCain obviously would have. Consequently it is likely that Titor's story was PROBABLY true, but our timeline changed due to his presence much more than Titor expected it might, and that we now have a chance to avoid the nuclear war of 2015. That chance would be amplified by whatever extent we are able to make progress toward Obama's stated intentions to ratchet down the nuclear weapons in the world. Our major threats are therefore not foreign terrorists and foreign countries but domestic right-wingers soaked in fear and hate (i.e. Limbaugh, Hannity, Coulter, etc.) and wanting to see Obama and America fail so that more war and strife would be justified.
Takehome lessons
Be smart, people. Titor came seemingly out of nowhere with a message about the direction our culture was headed and the consequences that would follow if nobody cared, and indeed he was correct about the major directions things would go. While details have not been 100% correct that is what multiverse theory predicts across slightly divergent worldlines as Titor illustrated by books not written and sporting events ending differently. But MAJOR things are less likely to be changed, so they are the best indicators of Titor's authenticity. Sure it could be just an amazing coincidence that Orwell's dystopia came late but reason and logic in the light of the internal consistency of Titor's worldview cannot falsify his story; on the contrary the test of time so far supports it. There have been many attempts to discredit Titor's story, by impersonating him and claiming to know his mother and even fabricating additional documents to conflate his original story with falsehood. Self-styled 'debunkers' seize on any discrepancy, typically ignoring or never understanding the implications of multiverse theory, and spout some of the wildest conclusions as if they have proven something with utter certainty. Their denial of any rational scientific view of accepting reality whatever the evidence indicates it to be invalidates whatever agenda it is they are driven by.
I know that the world I live in now is not the one that Titor described growing up in, although it easily could have been. That is consistent with divergence between worldlines created by the forewarning we received. Millions of people learned about Titor's story and watched it begin to play out at least, waiting for the other shoe of full blown civil war to drop. That had to have an effect. If Titor's worldview is correct enough of us cared to change the worldline, and Obama's inauguration would be evidence of that as most of us have chosen hope and change over hate and fear. Certainly hate and fear describe the direction Titor's worldline took, and since hope and change seem necessary requirements for changing the timeline, we may have exceeded Titor's opinion of us after all. Time will tell but we are not out of the woods yet. I like to think that the people of Titor's worldline that he judged so harshly did not have the benefit of the warning he gave us, and their normal human tendencies to place trust in their leaders might account for a lot of the 'apathy' that let things get much worse for them. We on the other hand know better by benefit of being warned, desired change, and it looks like it is happening. Only the stupidly warlike and apathetic type of Americans Titor so despised when he first got here could still cause Titor's prediction of global nuclear war to come true, and while there are still plenty of them, we have proven ourselves smart enough as a nation to abandon hate and fear as motivators and instead seek something greater and more noble for our country. You should still pay attention to whatever new evidence arises and keep your mind open to it, but don't be swayed by the arguments of lightweight right-wing loudmouths who will claim the story a hoax because they are speaking from superficiality and ignorance and they would be among the Americans that Titor detested for their complacency, apathy, and willingness to accept the status quo. There are still many of them and they would drag us down with them if they could. But we are better than that, America is better than that, we are not driven toward nuclear war like so many lemmings headed toward a cliff so long as we remain aware that WE create the world we live in. That we have the ability to guide the outcome of our worldline explains how we can have free will and is perhaps the most important message Titor gave us.