No way! In fact, it's just the opposite. Martial arts makes kids calmer and more respectful than ever. Children who have a positive outlet for their energy, who are taught self control and who participate in activities that boost their confidence and self esteem, have proven to be calmer, less prone to violent outbursts and more easily able to resolve conflict without becoming physical. They are also taught to understand that with acquired skill comes responsibility.
Martial arts is about peace, helpfulness and disciplined respect, not violence & disrespect.