Benjamin Franklin's solution to getting a person who hated him to like him was to get the other person to do things for him[1]. Doing something for somebody you hate causes cognitive dissonance, as you do positive things for a "negative" person, and the way this often resolves is through a reduction of those negative feelings (empathy may also play a role). Suspension and other punishments don't solve the underlying problem, which is a lack of empathy. A punishment of service to the abused seems like it would be more useful.