As far as I am concerned, pretending that bad actors simply do not exist has allowed some of the greatest problems I've seen plague organizations, drive out good people, and so on. I have noticed that saying you have a bad actor reflects poorly on the people doing the hiring (this insulated one of the bad actors until all of the relevant hiring parties left), but so much of it seems like willful disregard. I find myself sometimes amazed at how easily greased people are by snake oil salesmen selling largely themselves and a kind of "don't even worry about it" optimism.