I agree with a lot of this, and the framing is new to me and I really appreciate it. I especially appreciate the acknowledgement that there isn't necessarily anything wrong with having extreme beliefs; "extreme" is a label most often applied by antagonists of such beliefs. But I definitely feel like there can be a pipeline where one extreme belief may lead to others simply because they are also labelled extreme and not for a more recognizable reason.
I would counter with people who believe the earth is flat. This is in fact an extreme belief. The best part is, I don’t care if people believe this, not even a little a bit.
I care when they start arguing with me and trying to jam their belief down my throat. I didn’t even ask, you brought it up and you’re mad at me because I disagree.
I think this is the more interesting point to consider. Having a belief, any belief, is probably just fine. It’s the second part that’s the issue.
> I definitely feel like there can be a pipeline where one extreme belief may lead to others
Once you accept a premise that majority consensus of well informed people can be drastically wrong, it's not hard to then transfer that horizontally from one domain to another. So if you accept the possibility that scientists made up climate change - why wouldn't they also make up COVID? or falsify risks associated with vaccines? or any other number of things.
Underpinning all of this is some basic elements of humility and empathy - willingness to accede to a greater authority of others, and to weigh others experience that is different to yours as important in informing your views. Cutting those tethers gives your own belief system a new degree of freedom.