Google Alex Jones and John Gray, and find out what he did. (I happen to think John Gray was a kook too, but that doesn't excuse Alex)
Alex Jones is an egotistical would-be tyrant. Crazy religious nuts ranting about satanic plots and 2012 and cosmic awakenings is exactly the face the hypothetical powers at be would like to put on those seeking truth. In the 60s the CIA sponsored far left wing magazines in Europe (and even commited false flag attacks in Italy!). Why? To keep the far left from becoming all the way communist. They would take the movement 80% of the way there, then intentionally stall on the tracks. Standard COINTELPRO. Don't think for a second that all that covert domestic activity just "stopped", when they have every anti war protesters on terror watch lists and monitor the skies with insect robots: http://www.washingtonpost.com/wp-dyn/content/article/2007/10/08/AR2007100801434.html
This is what really happens to people who know or find out too much or are a threat to the official story:
If the conspiracy guy you listen to is a religious nut who rants and raves about apocalypse and doesn't tolerate differing opinions then you can just scratch him off the list of people to pay attention to.
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