Mekoff mentions Jane Goodall's "observation of a group of male chimpanzees pursuing and then killing all the members of another chimpanzee group over a two-year period.
Goodall called it "brutality," but maybe the other group had violated the chimp code.
I have a male cat. He has about 5 acres of territory, actually a little more than that. Pretty much every day he marks his territory.
I think the cat code of conduct means that everything inside of his territorial perimeter markings is his and everything outside of his markings belongs to other cats.
There are a number of cats who apparently violate the moral cat code to pay attention to territorial markings.
When they do this my cat inflicts cat justice upon them.
One day I was watching another cat seemed very interested in coming onto the property. We have a lot of gophers and it seem to be interested in obtaining one of the gophers.
But this cat had run afoul of my cat, the male who owns these gophers.
As I watched, this cat kept inching forward to the edge of the property then it would look up in the direction of where my cat probably was hiding. Eventually this would be gopher thief decided it was best to not violate the cat moral code of conduct and walked away.
Note: I’m sure your biology teachers would view this as an example of instinct… though perhaps it was learned behavior… Somehow the potential gopher thief cat assessed the situation and came up with a “right versus wrong” decision.