This mentality is a huge problem in America. We have insane amounts of corruption and just flat out crime. The corruption just rarely gets prosecuted in a courtroom

> 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.