The realpolitik of the thing is that when bad stuff comes out, the value people perceive the perpetrator brings is weighed against the bad stuff. In essence, cost of keeping them vs. cost of marginalizing them.

Some folks were just too valuable to marginalize. Some aren't. But that's pretty true of any space humans operate in, whether the bad stuff is Halloween costume choices or bad hygiene.

If there are a hundred Justin Trudeaus to choose from, the one that was racist gets left by the wayside (I think this is what scares people about this sort of thing... They realize they aren't special enough to step out of line).