Lee Harvey Oswald and Jack Ruby

It's preposterous to believe Jack Ruby murdered Oswald because Jack Ruby "loved his country."

It was obviously a "hit" (and Ruby was a nightclub owning protege of mobster Meyer Lansky, so he knew something about hits) in the grandest of mob traditions, to keep Oswald from talking.

Talking about what?  That is the only question.

It appears that not long after his final move to Dallas to work at the School Book Depository, Oswald was talking to Jack Ruby about making a hit on Governor Connally.  The Dallas Police knew about this because conveniently they had an informant right there as it was happening.

This is completely consistent with my theory that Oswald was both a CIA asset and FBI informant.  The assassination of Kennedy involved many kinds of actors (former CIA--Dulles himself, CIA, FBI, Mafia) and they were all spying on one another throughout this process.  Each organization didn't want to be the one left holding the bag.

Oswald was doing a sting on Ruby (trying to get Ruby to pay for a hit)  and others connected with Dallas Police were spying on Oswald and Ruby.  Ruby himself was an FBI informant as well (from a longstanding alliance between FBI and the Mafia).

Or at least that's what Oswald may have thought he was doing.  In reality, Oswald was being moved into position as Patsy for the JFK assassination.  And Ruby had said enough already to have sufficient motivation to be sure that Oswald never went to trial, a key part of the whole operation.  The top dogs like Dulles and LBJ needed someone with the means and strong motive to kill the patsy before he could do much talking.

I believe Ruby was very deep in the conspiracy himself, acting as Lansky's man in Dallas.  He had already gotten one or more talented shooters from his mentor Lansky in Miami for JFK, but needed another to handle Connally.  In the end, Connally was not shot (though, contra the single bullet theory, it's possible someone tried...perhaps from the book depository...I'm not thinking Oswald who failed the paraffin test, couldn't have been going down the central stairwell without having been seen, etc).

BTW, at this time a primary organized crime syndicate in the USA was the National Crime Syndicate, which included Jews like Lansky and Ruby as well as Italian Catholics.  Lansky was dubbed 'The Accountant' for his skill in making the most profit from casinos.