Answer: It hurts the community
Explanation: When you go up to someone that is a bully you are not just going to Punch them in the face, well if you do.
That would effect the community how?
Well, You can start trouble by hurting someone other people would get involved and more, and more until, a Parent/teacher gets involved and all those kids/people would get in trouble which would mean that "violence" is not the right option.