Why did they kill President Kennedy and Senator Kennedy?

There's no way Oswald and Ruby both just got a wild hair and did what they did on their own volition with no outside factors. Oswald didn't act like an assassin in his interviews he acted like a man realizing he was lied to and being set up. Ruby died of cancer shortly after and the government was working on cancer inducing weapons at the time.

And forensic evidence is casting doubt that Bobby's killer wasn't even at the right angle to match the bullets trajectory and there was another shooter.

Why did they kill President Kennedy and Senator Kennedy?
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