I think the intent was more for "hazards"- if a population panics and turns into a "mindless mob" so to speak- the party might have to find a way to survive it without killing- and the rules, show how much damage the mob will do to the party until it is subdued, and how much nonlethal damage party members would need to do to subdue it.
Just because it has stats doesn't mean you should kill it, even if it means you can.