More likely that conservatives turned liberal once the right went all in on anti-intellectualism.
Of course the real question is: what does conservative even mean any more? The joining of Falwell and Reagan fucked both conservatism and evangelical Christianity.
Yep, it's at least partly this. I watched a lot of "moderate" academics become "liberal" after Trump's first election.
If you're a scientist by principles and a moderate by political views, and the right-wing party comes out in opposition to science, well, it's fair that you might then join the "pro-science party". Being pro-science becomes a liberal position.
So it's not that conservatives were "purged" from the ranks of academia.
Of course the real question is: what does conservative even mean any more? The joining of Falwell and Reagan fucked both conservatism and evangelical Christianity.