You don't, do you? I mean like vampire in an alley deciding he wants to gnaw on a neck and goes to attack kind of thinking. Just pinging a vampire because they're there would be like pepper spraying the guy standing next to you waiting for the bus. Which is rude and a little over paranoid.
Hammurabi. He was a Babylonian king whose law code survived as an example to history of ancient human legal codes. His laws were very do unto others as you would have done to yourself. Kinda vengeful.