Aliens clearly exsist.

All the stuff about aliens is speculative, I sometimes do believe they exist, however there is no proof (proper) which confirms that they exist.
I think it's an urban legend however I'd like to mention this:

US should show to the world what they have in area 51! Okay, don't tell your military secrets, but atleast share the alien stuff you have there.

We all are the citizens of the world we deserve to know if alien stuff exists or not, cause they have the proof

]Actually Area 51 is a US bomber base. The secruity is there because most of the US secret jets are tested there.

I saw doc about it these people set up a camara and left it there for a day and all they saw where a few jets.

You think they'd leave it out on the surface for other Nation's satalites to see it? 22 "spy" satalites to be exact, and with that many, I doubt they'd leave all their stuff on the surface to be glanced at.
And seen as the quality of the cameras is immense (can pick out a penny in a field apparently) there is little chance that they wouldn't be seen.

You're right, it is an ex bomber testing facilty, and it currently houses the testing fields (along with another airfield in California) which test aircraft.

However, Aliens down there? Who knows. I'd say its more then likely that there is something of some interest down there.
Even the security in the Californian testing grounds comes no where near to that.

Scientists have just found that the night sky in which we see makes up only a tenth of one of the "tendrils" that make up our galaxy. There are 18 of these tendrils spiraling off of our galaxy, which means that there are 179 other tenths in our galaxy alone.
Now, seen as there are predicted to be 330 million planets in our galaxy, and we've found at least another 50 million galaxies, some millions of times larger then our own. So some are likely to have, what, 330 trillion (is that right?) planets in? And this is going barely, what could be compared to an inch on the length of Europe, Asia and America combined, out towards the distance we've found. So basically, if you look at the distance in which we know around our galaxy, and scale that to Asia, America and Europe if they were next to each other, and then took the longest distance from end to end, all the galaxies we know of, are contained within the first inch of that distance.
Yet we know of distance well, well beyond that. (The only way we know that its that distance, is because they saw a Star go Supernova and they calculated (I dont know how the calculation works) the time it took etc etc...)

And people still don't believe that aliens exsist? How can we be, in those teeming trillions of billions of planets, the only life? How could all life just be here and people still say that there is nothing else out there...

Anyway, your thoughts. As that, to me, pretty much ensures me that aliens exsist.

We are here and alive. Due to the sheer size of the Universe the chances are that somewhere in the vast mass of space there is another planet(s) which do have lifeforms on them.

and what if said alien race wish to destroy/enslave us?

I once saw this documentary about alien theories, and one theory was that there was a top secret alien settlement in Africa somewhere, but that it had turned into a slum, and the military were keeping them alive and sometimes torturing them to learn the secrets of their alien technology. Apparently a few years ago the humans went round evicting them all, because the slum had become too dangerous, and they found that some of the aliens were trying to re-activate the ship in which they had arrived, and fly away again. It sounds ridiculous, but it was quite convincing.