I think there's a certain amount of crowd mentality that happens, whereby when enough people feel entitled to speak disparagingly about a specific group of persons, it creates an opportunity for people to release unexpressed hostility that may or may not even be fully to do with a situation at hand. Everybody's certainly entitled to their own feelings, and for processing individual hurts, but I think it's short-sighted, of anyone but especially of therapists, to remotely suggest that demonizing those embodying an NPD construct (or any other personality construct) is a viable method for resolve. To me that's approximately tantamount to suggesting that bullying can be an effective means of conflict resolution. Anyway, I think that it perpetuates unresolve.
But then, psych practitioners aren't immune from their own feelings of unresolve and stored hurt.. or just simple battle fatigue from struggling to help certain subsets of clients.. as can come across more clearly than they may realize sometimes, though I can see where both of these writers made good-faith efforts, albeit perhaps littered with some unfortunate phrasings.
I'm of the opinion that it is in one's best interests, at least initially, to be as much interviewing one's practitioners as much as they are interviewing you, because there is a lot at stake in putting that kind of trust in someone. Sadly that can be a difficult task at times, but what's the alternative?