"And what do you do with a Martial Arts Master. If he or she is attacked and severly damages someone of kills them defending themselves, are they wrong."

Somebody I know, who was a member of UK Special Boat Service, used that ability to clobber two burglars he found rifling his home, in spite of being disabled and needing two canes to walk.

He went to jail for using excessive force.

I think that answers your question.