Are you saying the movie The Irishman seems credible because it was absolutely was not.

John had the audacity to nepotistically appoint Robert as his AG.

AG requires Senate approval, RFK sr was unanimously approved by the Senate Judiciary Committee. They were familiar with RFK's work as the chief counsel for this committee : United States Senate Select Committee on Improper Activities in Labor and Management

They investigated labor racketeering including Jimmy Hoffa working with NYC mobster Johnny Dio to take over the Teamsters Union.

Here's Hoffa testifying to RFK in 1957

https://youtu.be/RsQu9KeP06s?si=wVwTPVngBpVqtk2I

So the idea the mob was surprised by what RFK did as AG in 1961 seems weird to me.

To stop the mob trying to establish a trafficking/money-laundering foothold on Cuba, and destroying that Island-nation (with a checkered past.) There was a thing called Cuban Missile crisis

This all jumbled up. https://www.cubamafia.com/index.html

The mob was not trying to establish a foothold in Cuba in 1960. They were trying to win back a lost empire

The mob was in Cuba since the 1920s. By the 1940s. Meyer Lansky was working with President Batista who by the 1950s was the dictator of Cuba until he filed the country when Fidel Castro's revolution took over. Castro was elected? No he just assumed power as the leader of the revolutionaries. By Jan 1 1959 Battista was fleeing the country and the mob was on the verge of getting forced out

https://themobmuseum.org/blog/rise-castro-fall-havana-mob/

At first Castro sought US help but then came out as an open Communist, nationalized farms and businesses (some of which were US owned ) and cozied up to Moscow. By 1960 Einsenerhower was trying take Castro out and approved the bay of Pigs plan which disasterously went ahead under JFK in 1961. This open warfare was what led to the Cuban Missile crisis. Not the mob.