That's why the principles are important. Done correctly, a practitioner will learn that having the power to kick some .... doesn't always mean you use it. But knowing that you can makes a difference. It also builds emotional fortitude and character which changes the way a person carries his/her self which changes the way the world reacts to them. And, if worse comes to worst, the kid at the very least has the ability to evade physical confrontation. But really the magic is in how the practitioner presents themselves to the world. It's breaks the cycle from an angle that gives a bullied person the power and frees them from having to rely solely on an authority figure punishing the bully or protecting the kid from the bully.