It is clear by looking at the shape of the thing that, as the article puts it:
The result is a purity spiral whereby extreme kindness towards an in-group gives unlimited licence to act with cruelty towards an out-group.
That's clearly the motivation for a lot of it.
Reminds me of one of my other favourite recent insights (Shant Mesrobian on Twitter, Feb 2021):
The reason why so many extremely woke people turn out to have been bigoted in the past is because bigotry used to be the best way to bully and intimidate people, but now performative anti-bigotry is the best way to bully and intimidate people. An evolving toolset for sociopaths.
Now, I don't want to fall into the trap of just ascribing bad faith to people, as that's totally non-productive - you can't do that for individuals - you have to actually argue with the assumption of good faith.
But it is reasonable to do pattern recognition to see the shape of broader movements, particularly to be able to call out any sort of spin such as self-identification as "kind" or whatever. (It's a similar sort of sin to ascribe that sort of Goodness to yourself - make your argument, don't declare your moral virtue).