When one considers the assignation of J.F.K. what looks like a conspiracy is just an odd series of bizarre events
Lee Harvey Oswall
First lets look at Lee Harvey Oswall a returning defector from the Korean War. Back after a disappointing stay in Russia (CCCP) or (USSR) on his second attempt at assignation (after a dismal failure on a second rate politician) he scores the greatest play an assassin can accomplish, the death of the President. I put this all down to beginner's luck. Did he have any ties to the Mob, the CIA, the Cubans or L.B.J. Probably not but this does not mean they were not involved.
My theory
I speculate that there were five different assignation plots the Mob's, the CIA's, the Cuban's, LBJ's and Lee's. Only two were to take place on the day of the Parade, Lee's and I suspect the Cubans. Lee shoots first and with and Old Italian rifle he plants three shots right on the President, one being a head shot. The Cubans were sloppy shots (too use to using knives), probably didn't even come close to the President in fact their bullet could have landed miles away.
Now the tragedy
Jack Ruby must have known about the Mobs plot to kill the President and must have agreed to kill the assassin if he was caught. But what Jack did not know was Lee wasn't the Mobs boy but an all ready-cracked nut having his day in the sun.
LBJ
LBJ, after assignation, rushes to be sworn in ASAP because he supposes that something has gone a miss he is supposed to have more time to prepare for this. He assumes something has made them move their time table up
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