Communism is one model of government among many. Do YOU think that intelligent management of global resources requires communism? Is the United nations a commune because the member countries cooperate in some way? Isn't there an area between "independent actors acting selfishly" and "communism"?

I don't think they were implying communism. Which is good, because IME people on this forum can't have honest discussion or apply critical thinking in the vicinity of the subject. They start rhetoric-dumping and posturing and repeating tired arguments as if preventing thoughts about communism is their ticket to heaven. Sprinkle in a few posts positive-to-neutral on Marx to fuel the fire, and that's the recipe.