Capitalism as a principle exists for ~200 years while humans (homo sapiens) as a species exist for ~300k years. So why would you say something as insignificant on the time scale as capitalism is grounded in human nature? If you want to claim that political/economic systems can be part "of human nature," which I would counterargue, shouldn't we all live under dictatorships since for the last several dozens of thousands years that has been the prevalent system?