I found this fascinating quote today:
In my opinion a bully is someone who has low self-esteem, who for one reason or another feels a sense of power when he or she picks on someone weaker than themselves. When a bully sees the fear in their preys eyes, that gives them a great amount of power. The relaxation music we discuss here is for the victim not the bully.healingmusicemporium.com, Can We Stop The Bully With Relaxation Music? | HEALING MUSIC EMPORIUM, Feb 2009
You should read the whole article.