Why did John Wilkes Booth kill JFK?

I understand Harvey Lee Oswald killed Lincoln because he was sleeping with his wife, but why did JWB kill JFK? I heard it was because Marilyn Monroe was Booth's gf at the time, and JFK knocked her up. I also think it's really weird that there was no seating at the ampitheater where JFK was shot, and I... show more I understand Harvey Lee Oswald killed Lincoln because he was sleeping with his wife, but why did JWB kill JFK? I heard it was because Marilyn Monroe was Booth's gf at the time, and JFK knocked her up.

I also think it's really weird that there was no seating at the ampitheater where JFK was shot, and I always heard he was shot on a balcony, but he was in his car driving through the outdoor theater.

And what movie were they showing at the theater that day? I can't find it anywhere.
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