Cuba exports terrorism and misery across the region. The dictatorships in Cuba, Venezuela, and Nicaragua fly under the radar these days, but are no less noxious to humanity than the regimes in Russia, Iran, NK, etc.
You can argue whether or not sanctions are an effective way to promote regime change, or if they just hurt the regular citizens of rogue governments. I think they are often quite ineffective.
But there's no defending the Cuban regime.