Well a lot of times, kids follow the lead of their parents and other people that they spend a significant time with (maybe friends or other relatives). Also, it solves their social problems. After all, it’s easier to bully somebody than to work things out, manage your emotions, and learn to solve problems. ■■■■■■■■ is the proverbial “easy way out,” and sadly, some kids take it.
Another good point to bring up is that ■■■■■■■■ creates fear of the bully which in turn creates power for the bully. Some people want power and the only way for them to get it is to bully other people.
Sometimes they want attention and they aren’t getting it so they figure that the best way to get attention is to bully (that is not the best way to get attention btw)