I'd normally agree, but a large public organization is a bit different from a small local bar. the Nazi bar problem usually "works" because of an "apple poisons the barrel" deal. But when we're talking about a lake, it just dissipates.

It's the physical analouge to how Twitter can still be the most used social media website despite also having years of accusations about every kind of bad content under the sun. So if a group is large enough, I wouldn't be worried about that kind of inflitration.