But there have been people who moved from libertarianism or quasi-libertarian isolationism to Holocaust denial to something close to fascism or Nazism, or from libertarianism to neo-Confederatism to racism, so he's not entirely wrong.
Somebody else would have done a better job making the argument, but they'd do better to figure out just what was going on with this Jason Kessler dude. He was never a libertarian, so far as I know.
I am going to use this author’s logic to create my own theory:
Libertarians are fringe ideology, not accepted by the main-stream. Because I was in a Lutheran church for 15 years and some of them are my spiritual friends, I don’t want them to think I am insulting them even when I really am.
Flat-earthers, who wear khaki pants and often eat cheese, deny the moon landings. Some may believe the moon is made of cheese They too are a fringe ideology
Because there are self-proclaimed neo nazis like Christopher Cantwell, Richard Spencer who are also fringe ideologies - we can therefore state that Libertarians, who also often eat cheese, are neo-nazis who don’t believe in the moon-landings