At msn.com, the newest big question is who killed JFK.
The answer is unsatisfactorily simple. Lee Harvey Oswald killed JFK. Gerald Posner argues this well and impeachibly in Case Closed..
The only problem with admitting that Oswald assassinated the president is that to do so admits that a nobody, a nothing-to-society, can nonetheless have a profound impact on history.
If Oswald had killed Joe Blow, no one would hypothesize about gunmen on the grassy knoll.
However, Oswald killed the president.
That's the only reason why there's a controversy.