Communism is an ideology about murdering capitalists. That is baked into its DNA. Maybe some western European philosophy professors came along in the 1950s and sanitized the idea for their undergrads, but the idea is and always has been about violently overthrowing capital owners. You discount Marxism, Leninism, Stalinism, Maoism, and vanguard theory, despite this covering virtually 99% of all communists who have ever lived.

Nazis want to impose a pseudoscientific system of racial hygiene and they massacred anyone who got in their way. Communists want worker ownership of the means of production and the massacred anyone who got in their way. I see no difference.

Cuba is often shown as an example of successful vanguard communism. However it still hasn’t fully divested the communist party of its totalitarian power, and a lot of migrants move to Florida. So, it doesn’t really meet the criteria in my eyes.

Cuba is an authoritarian regime which should be overthrown and replaced with a liberal democracy. It is absolutely not a success story