As far as alien conspiracies go, I'm in the camp that strongly suspects that truth is probably far more boring than fiction. With fiction there's literally no limit to how far you can go with creating this impressively complex sub-reality that has us all staring out into the inky night wondering when we are going to experience an alien abduction and speculating on what the US Government is hiding from us.
There are several ways of looking at this: perhaps we are the aliens after all; the virus that's hungrily consuming everything in its path. Maybe the people in control of this whole sorry mess are the aliens? Or possibly, simply, there are no aliens. Could it be that we really are just sitting on the one rock that's set up right for life and as a hand wringing, God fearing, superstitious, hopelessly romantic species we can't cope with the concept that it's just us and that's it? More likely, says I. How boring.
Secrets and lies