What happened in Cuba after Castro came into power is similar to what happened in other countries after the revolutionaries won. We should try and understand if these sorts of people were evil to begin with or became evil as a natural transition after tasting power following a successful revolution.
Simply terming them as evil (honestly, Castro and others did many evil deeds), and not trying to understand and learn from the pattern is going to be a problem that humanity as a whole will suffer from.
