Yup. I think the ideas that people are wired to selfishness and competition, and/or paradoxically, are solely motivated by material gains and profit, is complete bullshit. I don't think you can tell any reliable story about "human nature", when >80% of social science research comes from neoliberal states and their institutions in the last 40 years...
The original "game theory" social experiments in the 20th century had to be repeated over and over again until the ghouls running them got the results they wanted.
That's my primary counterpoint: even if people being greedy assholes is "human nature" then why should the greediest assholes be rewarded the most for that?