If communism is the cause, then why would this same mentality be such a massive problem in America?
By communism I don't think people talk about the philosophical basis of an idealized society, but the totalitarian regime that oppresses a society and keeps the working class constantly in survival mode under the risk of losing it all.
You're nitpicking on semantics. Communism is the poster child of totalitarian regimes that oppress their citizens to extreme levels. When you talk about communism, people think of gulags, forced labor, murdering political opponents,and even force-admittong rivals to psychiatric hospitals.