I agree that concern about the consequences of a belief is important to the cluster you're describing. There's also an element of "in the past, people who have asserted X have had motives of which I disapprove, and therefore the fact that you are asserting X is evidence that I will disapprove of your motives as well."
Not just motives-- the idea is that those beliefs have reliably led to destructive actions.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.