John Ganz has a post up that digs into the seemingly contradictory connections between libertarianism and fascism:

For my part, I’ve always found something unsatisfying about all the explanatory frameworks. I don’t think history, politics, sociology, or psychology provide a satisfactory account. I don’t think this is all an accident. I think there’s something else at the core that determines the affinity between libertarianism and fascism. This was what I was trying to grasp in 2017 when I wrote about Rothbard in the wake of Charlottesville and said that they were both united by the notion of naked, brutal self-interest: radical libertarians believed this on an individual level, fascists, on the collective level, and it was not hard to switch between the two. Many commentators—both pro- and anti-capitalist—have noticed the analogy between the invisible hand of the market and a Social Darwinian “state of nature.”

Ganz’s piece is good and you should read the whole thing; I think he is right.

I also think that the simpler version is that both ideologies—libertarianism and fascism—are primarily about power and domination. When libertarians realize it is really hard to get what they want through the sovereignty of the individual, a lot of them will happily turn to fascism as means to that end. And it doesn’t hurt that most libertarians tend to be in-group white dudes.