to those that say, "Why don't the aliens just reveal themselves?", here's a few explanations.
You have aliens that are bad, some that are good and try to help us, and some that don't interfere.
The bad aliens/government don't want disclosure for obvious reasons. The bad aliens are the ones abducting people. They couldn't be anything other
than bad if they are literally kidnapping people and performing god knows what kind of procedures/exams on them. The bad people in government turn a
blind eye because they get technology in return. They believe that when SHTF the bad aliens will show some kind of mercy to them and allow them to
rule over us minions but they are too stupid to realize that they will also fall prey to them in the end. Such is the fallacy of a severely inflated
ego.
Then there are the good aliens/government that want to help the humans. They don't reveal themselves for the simple reason that people will freak
the eff out, but there are those who are not in the government who are in the know. Same with those in the government. They know that the bad aliens
betrayed us but can't exactly just come out and say, "Yes, aliens are among us!" and not expect to be killed, kidnapped what have you by others who
didn't want that info to come out. Instead, they slowly let the information flow. They allow the seeds to be planted in our minds in order to
condition us to the idea that aliens are among us so that when SHTF we won't freak out all that bad. They aren't too happy about humans being
abducted.
If it is revealed that there are aliens then there will be an all out WAR. Not only among humans but among aliens also. The bad aliens know that if
it came down to that they most likely wouldn't stand a chance because those in the government that aren't good nor bad but go with the flow because
they are afraid of what will happen if they don't, will side with the good and, in that case, the bad will be outnumbered.
It sounds lame but it has a lot to do with the notion of not interfering with the natural evolution of the human species. There has already been
severe interference and look at what it's done. We haven't evolved to the point where we are able to use this crazy technology responsibly.
That's the problem with good vs. bad. Bad usually has the upper hand because the good follow the rules and the bad absolutely don't. So the good
try not to interfer at all and the bad have trashed the rule for their own agenda.
It's like a human going into the forest to observe the wildlife. There's a huge difference between someone who goes in simply to observe, where the
animals are oblivious to the "invasion" and someone like Steve Erwin who pokes sticks at them and peeves them off.
I hope I made some sense. usually it sounds a lot better in my head