Classic example of Gurwinder Bhogal's observation: When intelligent people affiliate themselves to ideology, their intellect ceases to guard against wishful thinking, and instead begins to fortify it, causing them to inadvertently mastermind their own delusion, and to very cleverly become stupid.
https://twitter.com/G_S_Bhogal/status/1061011900278980608
A good addition to that thread was this response (for which I've lost the URL): Intelligent minds can certainly be furiously good at maintaining confirmation bias because they have so much more information and cleverness with which to justify their beliefs.
On a different matter, always reminds me of this.