Maybe there should be therapy for people who leave fundamentalist communities, it's difficult to abandon everything while telling yourself that God isn't damning you. That might be akin to having PTSD. Aside, at least here in the Western+European liberal traditions, most of the Christians (and members of other creeds) I personally know are pretty chill about it too, you're quite right there. But in the Bible belt it affects government policy over classroom science education, Roe vs Wade, and who votes for which political candidate. Also, until 50 years ago we still took blue laws (aka the sabbath) seriously. "Sodomy" laws prohibiting what consenting adults do in privacy, usually because of religious convictions, were repealed only in 2003. Our chill religious society is very recent and fragile...
I think this is very normal group/tribal identity and social influence at work, not mental illness. This applies to a lot more than just religion (which is why I mentioned group behavior above). There's the "third wave" experiment, but in more ethical studies, people form in-groups over arbitrary things so quickly that it's shocking. It's a bug or feature of being human. Agree with a political partisan on nearly everything but tiny details on one of their models, and they claim you're with the out-group. They've heard it all, and they already have a response designed to quickly deal with views that disagree. In our daily political life you'll constantly run into interpretive articles or YT lectures that oversimplify your political critics, teaching you how to dismiss them, while reaffirming your tribal identity..There are many books I have seen that get passed around Christian households detailing why other faiths are mistaken and what the correct view really is. Even some of the open-minded I know share things on why who they deem the closed-minded are wrong or are willfully insincere, while reaffirming their "correct" scriptural interpretation. So this isn't just religion. It's kind of normal. Hopefully that explains better the point I was trying to make about religion and socialization. Religion is the venue, socialization is what people do. Next time I'll be more careful in the first post haha.
Anecdotally, I know of hardcore believers who still do quite well as engineers+computer scientists and so forth. They have strong communities and familiesr. I can't say, in this case, that their beliefs are disabling. Misleading maybe, but not enough to be unable to function in society or find happiness. These types are puzzling.. but I think it comes down to the above, tribal identity, not mental illness.
Since we agree on most other things (you are right that YT can do whatever it wants) there's no need to rehash, but I'll look up some of the stuff you're talking about. No offense to whistling Dixie, it's a nice turn of phrase.
I think the YT problem is that discrimination has different word senses/meanings (like a crop can be any of these: a photoshop job, a style of haircut or a harvest). The definition I see about discrimination is specifically about treating people based on the groups they are in. If I read you correctly, what you are talking about seems to be quite different, more discrimination in the sense of judgment about what a thing is and what it does--but no group is entitled to have people sign up for them.. Anyway if YT takes it as far as you are saying, it's going to be a gong show. They'll be revoking major media documentaries.. time to break out the popcorn..