This is a bit frustrating - part of the premise is that people who are engineers somehow have a predilection towards extremism. Then they admit that that it's a tiny proportion of engineers overall. Then they mention that it could be random effects - an extremist group that's strong in an engineering school would of course recruit more extremists, for example. But they dismiss that with "well we didn't notice that" a…
Yeah, there's so much wrong with this paper that it ceases to be wrong and just enters a realm of academic Dadaism. It's basically impossible to even formulate a working hypothesis without having a deep understanding of the socioeconomic drivers and effects around educational attainment and post-graduate alienation. The idea that engineers are inherently radicalizable runs counter to the academic thinking on the subject -- the article is provocative, sure, but extraordinary claims &c....