Murder. Killing. Homicide.
The act of taking another human’s life had many names, and society called all of them a crime. It was immoral. Even setting morals aside, removing a member of society was, in most cases, a detriment to the whole. The act was innately abhorrent, and even when completely justified, it often left the killer traumatized.
In the comics he’d read, the moment a hero killed a villain was the moment he became one himself. It