You’re confusing capitalism with human nature. They’re not the same thing. Humans are certainly prone to selfishness and greediness, but we’re also very much creatures of community. If we had not, we would not have lasted nearly as long as we have. It doesn’t make any sense to be an individualistic, greedy asshole when that can get yourself and others killed. Humans very much had to work together for much of our history, often for basic survival. If we had had a capitalist mindset back when we were mostly hunter-gatherers, some of other creature would be dominating the planet right now.
So, believe the propaganda that we’re all self-centered greed assholes if you’d like. But history tells us a different story. 
