Most people don't have a problem with using them in a situation like that, but zapping a tagger in the back is asshole behavior and should not be tolerated. There was no self defense here. The suspect is unlikely to be a danger to the community. It's a disproportionate response that ignores the inherent danger in the technology.

I think Police should carry stun guns, but they need to be treated like the potentially deadly weapons that they are.