I concur with ruthless on this. Laws and rules have their justification.
But I have to agree also with you that these weren't necessary if ALL people would be, let's call it
enlightened.
Having an environment where every single person on this planet would get what he/she (at least)
needs - and that is possible with the earths resources as a whole - then the motivation for most crimes would fall away. Why steal a TV when you can get one without stealing?
The problem though is that, even though if everyone would be enlightened, then you still have a problem with people who just can't get enlightened because they lack the mental capacity.
Don't get me wrong here, I'm not saying only over-intelligent people could live in such a world.
I'm saying that we are so diverse in every aspect from each other, that humanity can never have a consensus on something.
And because of that I hope it will never be possible that any everyday joe could get his hands on a time machine in the future. THAT would be very scary. Just imagine a psychopath who wants to go on a killing spree. He travels back in time over and over again to bring back dozens and dozens of himself until he has an army, just to wreak havoc!
Then again I wouldn't want this technology in the hands of governments either.
Time travel and corruption go easily hand in hand.
So the best scenario would be for a single scientist to make the discovery who, at the same time, has a very stable psyche and is something like a philantropist.
But then again, maybe his stable psyche would tell him that manipulating the past could never lead to
fully controlled, good circumstances and thus decides to destroy it.
OR he could use it only for the sole purpose of preventing others from inventing their own time machine. So as soon as he knows someone made the discovery, he jumps back and prevents it.
Maybe THAT's the reason why we haven't yet been (knowingly) visited by time travellers, since the good scientist from before plays time cop.^^
Just kidding.