http://www.jfk-online.com
I've no connection to this site, and it's positively pro-SGT/anti-Oliver Stone, but anybody interested in a thoroughly and systematically put-together contribution to the JFK assassination debate should spend a few hours there, then come back and post hypotheses unsubstantiated by anything more than tenuous parallels with their own experiences.
IMHO, it's beyond the realms of possibility that any conspiratorial agency would employ a contaminated flake like LHO. He was no different from Mark Chapman, John Lennon's assassin. Wait a minute, though; I suppose that makes me part of the conspiracy to discredit him. Oh well.