When faced with a "Who done it?" ask "Who benefits?".
Thank you Agatha Christi. But reality is that murders happen for all kind of reasons even if no one benefits.
Kennedy's murder was not a 'who done it" unless you care to run down a rat trail of ever less probable or even possible scenarios.
But the conspiracy hustlers have made many millions of dollars off people who are logic challenged or simple can not accept that a total loser like Oswald could have made a couple of shots from a window that most novice shooters could have easily made as well.
Give me some facts, not convoluted or implausible theories.