I think there are believable parts to every conspiracy theory, that's why they get started in the first place... When something rings true, it will gain some traction. As for what I "wholeheartedly believe", as per the OP? Hmm, well I believe that we would be exceptionally naive to think there is not intelligent life somewhere else in the universe. I guess that's not really a conspiracy though. As for our government's knowledge of such intelligent life, I think they probably do, but I can't say I'm convinced "wholeheartedly" that they know, just that I believe they're out there somewhere. It's simple statistics.