Arguably, The US does have several socialist policies, albeit implemented very badly. For instance, public education. Does capitalism stick its grubby fingers into it from every possible angle? Yes. But at its core it has collective funding through taxes (therefore owned/controlled by the state), universal access, and the prioritization of public welfare over profit (at least on paper). Those principles are strictly socialist and not capitalist.
Where did I say “government does stuff”? If a service is provided not for profit, funded by the community and is otherwise not privately owned, it’s socialist. It needs to be for-profit and/or privately owned to be capitalist.