Sorry, but the AGW and JournoList scandals support my position, not yours. They were unable to keep their secrets for long.
And there are a LOT more people who can rationalize to themselves lying about AGW or suppressing negative stories about Obama than planning or covering up the mass murder of first graders.
Server Time ~~ can't touch this!
The AGW crowd kept the lie alive long enough that the president believes in global warming, as does almost every democrat lawmaker, and about half the republican lawmakers, and most of the college professors, and maybe half of the scientists that provide science news...
Actually, there is a case to be made that the AGW conspiracy is ongoing and pretty sucessful.