The metric for me is that people who like certain fetishes don't cause harm to others, break the law, etc. If there's some evidence that his fetish affected how he performed his duties, I'd say it was a problem. I think public perception goes a long way, and I can understand why he resigned.
I guess I can recognize where people are coming from with the "thought processes", it seems natural to assume people into rape fantasies would have more wiggle room to excuse actual rape because hey thatsmyfetish.gif. In reality it doesn't work that way for me. You can't help what you're into but you can be aware of your kinks being problematic, and make sure you never overstep boundaries that would make those kinks hurtful, dangerous, illegal etc for other people. I entertain rape fantasies, but I believe in real world situations that rape is always the fault of the aggressor and no amount of alcohol, short skirts, walking around at night alone, or whatever other excuses people make ever makes it acceptable. I've never read a news story about someone being sexually assaulted and felt any positive or sexual feelings about it. Paradoxically, I'm only okay with it when it is a fantasy that can be controlled, and that the participants can consent to. I can really only speak for myself here, however.
I feel like this thread is going to go places, it seems likely that the man in question didn't have positive emotions towards rape ("tolerates" being on the negative scale of their tagging system), but it was an issue with unclear elements on the website that just looks pretty damn bad for him.