social security is a socialist concept, medicare and medicaid are socialist concepts, public transportation is a socialist concept, unions are a socialist concept, etc. I think it's fair to say that humanity is evolved enough to handle these institutions and concepts.
The debate is over the ratio of state (aka public) vs corporate (aka private) control. Where America is unique is that there's an ingrained cultural aversion to the very idea of public power and society itself due to a long campaign from Republicans and Conservatives seeking to destroy society so that the interests of private capital can run amok. Most other OECD countries have taken a different path in the 20th century that culturally and materially solidified the gains of the public interest, and have private interests relatively kept in check, which is why this is the only country where socialist is a dirty word. The reason America doesn't provide as robust public benefits to its citizenry as most other OECD countries isn't because of a cap on human psychology, it's just a widespread, semi-successful misinformation con job.