I know a few people in rural US who made the jump from a super right US Libertarian position in late-teens/early adulthood all the way over to Marxist positions. I'm not certain, but I suspect that the US Libertarian and Republican mindsets are often normalised there so people are raised with them by default, but a lot of the underlying ideas that validate the US Libertarian position, like individualism and "freedom", work better as abstract ideas and tend to break down upon inspection. Most of the additional freedoms of the US don't matter when people don't have the money, health and other resources to make use of them. It just allows the rich and powerful to trample the rest.