I can understand people starting martial arts training to avoid present or future bullying but... for things that happened time ago?. Doesn't work. Healing past psychological injuries is not the purpose of martial arts training, imo, you have therapists for that.
In my experience, people who starts martial arts training without coming clean are looking for more trouble. Not for feeling helpless again but to not facing what made them helpless back then.
Now that you mention the horrible Karate Kid movie, Daniel-chan kicked really hard the bad guy, in a light-contact karate tournament nonetheless, isn't it?