The older I get the more improbable most conspiracy theories seem. Usually the thing that fukks up the conspiracy theory is how many people would have to keep their mouth shut about it.
I mean I'm sure there's shyt going on behind the scenes that we don't know about, but most of the theories are probably way off. The world is complex and many people like to simplify it - things are black and white to them. As you get older you can clearly appreciate that most things are in the grey area.
The alien thing is interesting. There's literally no good evidence that aliens have ever visited earth, but of course its possible. In 100-1000 years human beings will probably be visiting other worlds beyond our solar system so its possible that other species could have evolved way beyond us. But if they're so advanced they probably know of millions of planets that contain life so I doubt the earth is that special for them to want to visit. They probably can figure out the whole history of planets in seconds, they may even have a hands off policy.