The US has killed, jailed, blacklisted, and otherwise denied civil liberties to people for having leftist politics. Whether that's "purely capitalist" or not, it's still not safe to be a leftist in the USA.
I don’t disagree.
Remember that “shocking” scene from the Newsroom years ago where the main character had the audacity to suggest the US wasn’t the freedom-est country in the world?
The rest of the world just nodded and said “yeah, we know”.
It's not. It's got nothing to do with capitalism, pure or otherwise. In fact, I think there's a case for saying that the US state is both very large and highly invasive in people's lives both in, and outside, the USA. And that's a very un-capitalist trait.