Don't you know, it's been covered up! This allows him to make any statement without justification. And you questioning that the government hides information allows him to claim that *you* are detached from reality.
Really, saying the government has covered something up is always the perfect explanation for any conspiracy theory. You don't need anything beyond it other than a bold imagination!
The assassination of JFK? Government cover up.
Moon landings? Government cover up.
9/11? Government cover up.
TMI? Government cover up.
Missing socks in laundry? Government cover up.
Actually, there are a lot of fishy things about the assassination of JFK, and the Warren Commission's report that found a "magic bullet" is about as reasonable as fairies and unicorns. But the others, I agree with you.