I don't know what 'urban' areas you are talking about, but many are filled with some nasty damn dogs trained to kill. They protect drug dealer's stashes and they make the average Police dog look like Lassie.
These guys are very familiar with dogs.
My exact point. Most inner city residents have only seen vicious dogs, be they guard dogs, police dogs or drug dealer dogs. ANY dog, including the world's most friendliest beagle (our dog) scared the wits out of them. A real shame.
Given that attitude, I doubt any urban jury would convict anybody of killing a police dog, since they had reasonable fear of their life.