I think we simply disagree on this point. People enjoy being 'nasty' because it elicits a reaction that is more mentally rewarding than performing the often repetitive tasks of their job. If the job was made more fun, psychologically rewarding, and not repetitive, i think we would see a massive dropoff in the perceived nastiness of players. This is no easy task, but if performed correctly it would massively increase the longevity of Identity and prevent a slow decline into a community of trolls.
There are plenty of people who enjoy being nasty, it would be naive to disagree, and being corrupt would not be without consequence, but those consequences should be within the boundaries of the game. (there are evil people in real life too, so its not against rp)