He who excels in defeating his enemy does not join issues.

The practice of martial arts and its underlying philosophies (Buddhism, Taoism, Confucianism) teach us respect for others. Buddhism also advises us to practise detachment.
Human interaction often involves conflict. Conflict is not necessarily violent; conflict of a sort arises when two people who live together want to watch different television programs at the same time. Conflict can often be resolved through negotiation; often, everyone involved can win. We watch one program, and tape the other.
Respecting others includes allowing them to carry out their own affairs, and giving them the opportunity to resolve their own conflicts. People learn and grow through fighting their own battles. To involve oneself unasked in the affairs of others is patronising.