Sorry, but that does not matter. If they did anything illegal, they should be prosecuted by and in the country it happened, but you are presuming collective guilt here. That is always, universally, the wrong thing to do.
We are talking about the descendants of the wealthy or dissident people who were escaping the Cuban revolution, where Cuba at the time was largely owned by foreign sugar plantations which was perpetuated by the the brutal military dictatorship of Batista, which was supported by the US government as well as organized crime (and where one ends and the other begins is sometimes unclear…)
The legacy of colonialism still casts a dark shadow. You can replace who rules much easier than changing how they rule. Batista a dictator replaced by Castro another dictator.
It was a better lie when "the people we robbed and killed totally deserved it" was about Kulaks. Seriously it is the same victim blaming bullshit to absolve a government of thieves.