I find it terrifying because yes, I do see it in action - even here on MN, as you say! People who, when presented with hard, irrefutable evidence, just dismiss it and keep repeating the mantras: Why do you care, you don't know them, it's racism, different opinions aren't welcome etc etc.
I've observed it for a while now and it's scary. I've argued many times against the 'You don't know them' line by saying that, with all the personal stuff H & M have put out (documentary, OW, Spare plus many an interview or word-salad speech), we do in fact know a lot, and from their own mouths. But this is always met with silence, or just a repeat of 'You don't know anything about them'. It's moronic and depressing to anyone brought up to take an intelligent interest in news/current affairs etc.and to look critically at things. My retort is usually 'Well, in that case...are you saying that H & M are lying to us, if you claim we still know nothing?' Again, silence.
I get that many of their supporters are being directed to come and disrupt and derail discussions. But what I don't get is, what to they get out of it? What do you gain from deceiving yourself in this way? From ignoring or dismissing hard evidence that things are not the way you claim they are?
Willing self-deception is a strange thing, and something I can't fathom. But maybe it's the way some people cope with the tough world we live in. It gives comfort but asks you to believe unlikely things, rather as religion used to do.