You don't have to say "some people are bad" but rather "some behaviors are bad or dangerous" - and teachers certainly can and should discuss bad or dangerous be

You don't have to say "some people are bad" but rather "some behaviors are bad or dangerous" - and teachers certainly can and should discuss bad or dangerous behavior to correct it and to recognize it in future. They already do so for behavior that is physically bad or dangerous, why not for behavior that's psychologically bad or dangerous?