Okay, first things first. I think it is an incredibly arrogant viewpoint to think that we're the only life that exists in the universe. On the flip side, I think that it can also be arrogant to think that life from other planets is visiting us here, no matter what my personal beliefs on the subject might be.
As far as the videos go... they, along with the infamous STS-80 video (not sure if it was included in the second video, didn't get a chance to watch it all), seem to point that there's at least "something" out there in space around our planet. There's all sorts of evidence out there, from the Japanese passenger plane flying up near Alaska that had a close encounter with a supposed "huge UFO", to one being spotted on a local airport radar, and then confirmed by NORAD before being denied later. All of those stories seem to imply that there's something going on. Whether or not it's aliens from another planet, or it's secret military testing going on we can't be sure until the United States or other governments start disclosing the information. France started releasing its data about two years ago now I think, the UK has partially followed suit, along with a number of South American countries.
There also seems to be evidence that would lead one to believe that the Nazis had been in contact with visitors from "elsewhere", based on the massive amount of technological advances they made in a relatively short period of time, during the lead up to and during WW2. Then you can also look at what has happened with further advancements since that time, which seemed to directly coincide with German scientists being brought to the United States following WW2.
I think part of the reason why we don't see this stuff being discussed in the mainstream media is because belief in alien life has been painted as a fringe belief, with the majority of believers being lunatics. For every sane and rational believer in alien life visiting us, there is a Steven Greer making us all look like fools. It certainly isn't beyond the realm of possibility that the reason these beliefs have been ridiculed over the years is because of a directed disinformation campaign perpetrated by the United States and other governments around the world.
Why might governments not want us to know about life on other planets? There are a number of different theories for that.
1) Fear of mass-hysteria. The idea that we aren't alone in the universe and there are being from other planets visiting us could set off complete chaos around the world. Especially in the aftermath of Orson Welles' War of the Worlds radio broadcast. Some have even postulated that the broadcast was done in an attempt to see what the public reaction to an alien invasion or even alien contact would be.
2) Similar to mass-hysteria, it could set off a complete crisis of belief amongst the population. When you consider that 54% of the population of the world are followers of one of the Abrahamic religions or their offshoots, it would have the potential to have over half of the planet openly questioning their beliefs, and who knows what that would lead to; global instability or renewed questioning and perhaps a new global enlightment.
3) The governments that have knowledge of these things would like to keep it to themselves. Especially if they've known for upwards of 60+ years now. People could lose even more trust in their respective governments, especially here in the United States, which again could lead to potential global instability. The people in power want to keep that power.
4) There is a group of very powerful global leaders (the Illuminati, Majestic 12, Masons, etc) that want this information to be kept from the public for one or more of a few different reasons.
* They are in fact aliens themselves
* The time isn't right in their view to bring about a "New World Order". Either because they don't have the necessary pieces in place yet, or they don't feel the public would be accepting.
* They feel they would lose their control over the world, there could be a mass-revolt that brought about their New World Order in a way that they didn't intend, and they could be deposed
5) These beings are hostile, and certain governments around the world are working on ways to be able to defend ourselves, and letting the public know would again cause mass-hysteria. Or perhaps we have a deal put in place with them, maybe they gave us technological advances in exchange for them being allowed to perform experiments on the earth or its inhabitants, or both. But there was a time-frame put in place where they weren't allowed to disclose any of this for a specified number of years, or perhaps never.
There are more theories out there, but I think those are some of the more common ones, and most easily believed among them.
I think there is more than enough evidence out there to prove that at the very least we aren't alone in the universe. But I think there is enough circumstantial evidence that points to a potential alien presence on and around earth. Whether they are hostile or friendly is beyond any of our knowledge at this point in time. Why they would be visiting us is a very big question to which there isn't an obvious answer either. There are many conspiracy theories around as to why that might be, but there obviously aren't any concrete facts.
That's all I have time to post for now... I'll try to get back to this later on tonight or maybe tomorrow morning. At the very least, it should be helpful to get some discussion going.
