Because it’s an extreme claim backed up with no evidence. Hanlon’s razor applies here.

Also see Hitchens' razor and Russel's teapot.

At least in parent's case, probably because the vast majority of their comments are black-and-white hot takes that are always downvoted regardless. And they basically never respond when asked for any sources.

Yeah bad faith commenter then

I’m sorry who did you mean to say this to? Not sure this is relevant here