I think a lot has to be said for the discipline and sacrifice needed to train Martial Arts. Millions sign up and last a few months/years, then life, time or it's just “too damn much” gets in the way. It's a whole lot easier to stop going to class than it is to keep at it, day after day, year after year, pain after pain. It forges our will in ways we sometimes don't realize.
Nobody is ever ready for a surprise attack. Not the soldier, not the sailor, not the butcher or the baker. But the attacker is not usually ready for a man of will to turn into him with fury and purpose. Tables turn easilly, especially when attackers do not have time to take controll of a situation they are used to dominating. As Mark Twain once said, “A man who picks up a cat by the tail learns a lesson he can learn in no other way.” So too, does the bad man learn what it means to attack someone who has forged his will through training, discipline and sacrifice.