As a biologist, I hate the LIE that humans are naturally greedy. That simply isn't the truth. We literally have a part of our brain built to care about each other and build community, selflessness is in our literal biology. That's how homosapiens were able to evolve as quick as they did, that's how they spread as quick as they did. The ISSUE is that humans, today, are forced to be selfish. We live in an economic system that inherently goes against our biology, it makes you think that humans are naturally selfish because in a world where people are forced to put others down, take whatever they can find, keep things to themselves, push others away, ext, that all is against our NATURAL needs and desires. Communism is the only "natural" economic system, because it's the only one that requires community. The others actively go against it.