the blind worship of obvious frauds and grifters like Candace Owens, Melonie Mac, Brittany Venti and so-forth

I think one major difference here is that these are arguably attractive thots. The kind that would have simps regardless of their politics or opinions. This is one problem.

Rowling is not attractive, she is old and looks incredibly British. She has defenders because of instinctual pro-women reflexes people have. This is a second problem.

These two problems usually are combined and the end result looks similar, but the root cause is different enough that it takes a different argument to get guys out of the mindset and out of supporting them blankly.