Perhaps it is also not applicable to geopolitical co-existance with imperialist countries like Nazi Germany and the USA?

Communism is bad in practice, but it's also bad in theory. It's not like if people were more moral, or more rational, or if we had the government run by a smart computer, communism would be possible. Setting that aside, there's also no reason to prefer communism over a free market, or pretty much anything.

tl;dr don't grant it moral credit.