Heck, I figured it out years ago.
Two Italan Americans that The Mafia idolized were Frank Sinatra and Joe Dimagio.
JFK had a friendship with Frank Sinatra, going so far that Sinatra was going to build a complex on the West Coast that soon to be President Kennedy could call "the Western White House".
However, after the election, old man Joe Kennedy took Sinatra aside and told him the President could not be partying around with a "saloon singer". Sinatra was pissd.
The love of Joe Dimagio's life was Marilyn Monroe. Even after her death, he had fresh Ross placed on her grave weekly.
Everybody knows how Kennedy fucked over Marilyn. Dimagio hated both John and Robert.
The Mob knew this. They also knew how Robert reneged on the deal to go light on the Mob after they got the vote out in Chicago to give JFK the win in Illinois.
Through sources, the Mob learned that Castro felt like he had the right to have JFK murdered because JFK tried to have him, another World Leader, assasinated.
Castro also had a man to do the job, Oswald. So, the Mob set Oswald up in the US, supported him, and gave him the means to be in Dallas on that fateful day.
Kennedy fucked over Sinatra. Kennedy fucked over Joe Dimagio. Kennedy fucked over Castro, Kenndy double cross d the Mob.
After the deed was done, a Mob associate, Jack Ruby, convieniently killed Oswald, on National TV, and took the fall.
It was personal. Not political.
The question to me is not if Oswald did it. He did, the big question is how did he pull it off, and why.
This is as good as what the Earren Commision came up with.