Castro wasn't the start of the problems there, he was the result. The way the Americans treated Cuba as colonial spoils of war and the ensuing post-revolution embargo is what messed that country up and allowed Castro to obtain and keep power.
Blaming Cuba going the communist dictatorship route and seeking refuge with the Soviet Union is no different than a country like Ukraine looking to the West for support. It's a direct result of being pillaged by their neighbour.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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