@left_adjoint as someone who was There At the Time, that's an insightful way to look at it.
However, I think the more material causes are a lot simpler: 1) the movement attracted lots of white guys and otherwise privileged people who did not have anything more important to worry about or any more important lenses to see the world through, like poverty or sexism or their ethnic community or whatever; and therefore it kept attracting them/driving out anyone else who called them on their shit; aaaand
2) the movement "texts"/philosophies, like warmed-over 19th-century anti-Catholic propaganda, slightly fresher post-2001 Islamophobia, and the deterministic, reductive biological philosophy of Dawkins and others, already dovetailed pretty nicely with a lot of more unsavory ideologies.
So it was a group already predisposed to this kind of thing. Like you put that many white guys together, they're gonna get racist.
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