The short answer to that is nobody likes to look at their own flaws and their own stuff. It's difficult for people to acknowledge that this is happening within their group. It's always happening somewhere else. I think there's that blindness to seeing what's clearly there and open in public. That blindness is exploited by these groups, because they can operate and do things that often do not attract the scrutiny that they should.
On May 5th, 2022. See this statement in context.