About 20 years ago a Baltimore Sun reporter made the case that the shot that killed JFK was an accidental discharge from the AR-15 of one of the Secret Service men in the open Cadillac behind the President's car. A lot of very convincing evidence was assembled to support this sad but very likely accident. It is supposed that either Lyndon Johnson or Robert Kennedy took charge shortly after the event, and decided to protect the bodyguard out of either compassion for an obvious accident, or to make sure that "Camelot" wasn't remembered for a mistake. There's also a lot of evidence that Huey Long was killed by a shot from one of his bodyguards during the attempt on his life by Dr. Weiss.

As for whether or not the three shots of Oswald were replicable, experiments done at the HP White Labs in Maryland for a television network in the late '60s a gunsmith named Howard Donahue was able to duplicate Oswald's alleged shots several times on an elaborate range simulating the Dallas site, and using a rifle identical to Oswald's.

The video game is in very poor taste, but so are most of this ilk, and there is a multimillion dollar industry involving books, speakers, TV shows and movies already extant. This just pushes the envelope.