"Remember the Star Trek "prime objectve?" No interference with life as 'they' know it."
I agree with this. I believe that species who are intelligent enough to have space travel also have a way of interacting with other species not yet ready to take on the final frontier. Put yourself in their shoes, what would we do if we were in the midst of space exploration? Since our society is based on rules, there would then be rules for interacting with other species for our own good and their own good. Of course, some species that already possess the technology of space travel may be a society in which they do not have any rules, therefore they would be labeled as hostile. I would then make the conclusion to hoping never to meet a species like that in the near future...
Ignorance is a predominately uttered word in the world today. I believe that the people of this world are not yet ready to interact with an "Alien" race and if this ever did happen in the near future, mass hysteria would dominate the world. There are still clashes now about the color of our skin, so what would happen if we met someone totally different to us. This is the exact reason, I believe, why the government is hiding contact with other species, if we ever made contact in the first place. From me saying contact, I do not mean face to face contact, if could easily be radio contact also.
Many things in this world are unexplainable, but just wait until the day(if ever) we travel into space. This would totally change the way we live, but would it be for the better or worse? I believe that it would be for the better, maybe not right now, but someday...