Its beyond my understanding... period.
Just imagine maintaining mutually exclusive beliefs simultaneously — “I’m not a racist who judges people because of race / I cannot be a racist because I’m black but you’re racist because you’re white” or “everything that offends me must be removed from my sight / I’m tolerant” are examples. The result is a kind of madness, an insanity.
Sane people can comprehend madness for everyone has a little cray cray in their lives. Many ordinary crazy people can still appreciate sanity because they may not be totally insane.
But when an ideology drives one into functional madness the mind erects barriers to protect the inconsistent reality that they have accepted. These excuse and accommodate problems with their ideology rather than examine and permit refutation. In this way they are unlike proverbial frogs in frying pans. A frog, incapable of self-delusion, jumps out and avoids death while humans will excuse and rationalize their way to being fried alive.
The upshot is that this sort of madman progressively loses even the ability to realize they are lunatics. Instead everyone who is sane is seen as alternately insane or (more likely) evil.
And all the generations that have come before are likewise judged evil, subject to historical revision and removal from view ... to correct the record of course, not to eliminate history.
This last, though, is demonstrated false BECAUSE these same people lust to spatter the names of folks they fancy were like them all over the place. At least the Islamists are sane enough, liars though they may be, to realize that they may be engaged in a civilizational conflict. PCdiots lack even that.