I don't get your point. If you are trying to say the US's bad deeds make his bad deeds okay then I don't agree with you. Just because America is imperfect and has done alot of fucked up things doesn't justify the bad things other countries do.
Granted that two wrongs do not make a right, but then Cuba had no influence on the life of US citizenry, on the other hand the bad deeds of the US government had deep influence on the cuban people standard of life,
so things are not symmetrical at all as cubans had to suffer daily the consequences of the US embargo..
What did matters worse were those helms burton laws that were illegal in international right because the US
forced other countries to follow this embargo, at the end the US governement was just starving the cubans in the hope that they would revolt against their government.
It isn't as if they were given due process to defend themselves from those accusations so we have no idea how many "deserved" it.
Certainly that some abuse occured but i dont think that they killed people randomly, and the extent of the corruption and illegal murders under Battista was such that a few thousands is quite a lowish number, i mean almost any policeman or responsible was a thief or else he would had been replaced with one who did fit the US gangsters who were in control of the island.