I left a comment at Ask Me Your Dumb Questions About Socialism that Jon Carey "re-posted for truth", so I thought I'd post it here too:
Critics of socialism love to talk about their concept of human nature, which tends to bore socialists, mostly because capitalists’ assumptions about human nature are like feudalists’ concepts: self-serving.
But I do think there’s one interesting element. Under any system, most people like to help others. Emergencies regularly bring out the best in people. But when there’s a choice and all things are equal, nice people are more likely to be helped sooner than assholes. Capitalism changes that: the asshole with money gets helped while the nice person without money hopes some help will trickle down.