Extremist to progressive to fringe conspiracy nut. Not the most surprising arc when you think about it.
Seems to happen more than I used to think. The number of right-wing media types that have some Marxist/leftist background is quite surprising. Tend to see it in those that want racial change and when Marxism (leftist politics as well) hasn't worked out, they pivot to the far right.
On top of that you then have the grifters and even some of those grifters can eventually buy into it.