Why be communist?

I don’t understand communists. So many people on here and other posts where they support communism so much and hate capitalist countries yet they live in capitalist countries and enjoy our capitalist ideas. if communism is so beneficial why not go live in cuba and live like the actual citizens of cuba so you know what it’s like? and i’m not talking about havana or varadero or any of those tourist places, im talking go live in a regular small town where 90% of citizens live and live exactly like they do. where you go to the store and you can’t find food just empty shelves. where you go to the hospitals and the needles are cleaned and reused because there are none. where there is no medicine. i truly do not understand communists. and enlighten me and tell me why anyone in the world would think communism works after seeing how venezuela and cuba are. where is the prosperity? i am genuinely curious to what communists think communism is. unless ofcourse the only reason they agree in communism is because they themselves want to be the dictator….than that’s another story…