When your bucket is full, you're pretty happy. When it's pretty empty, you're rather upset. Cole Matthews, a troubled teen in a book called Touching Spirit Bear, had a usually empty bucket. He was a really lonely guy, and he had no friends. And how did he try to solve his problem? He bullied and robbed.
He had a need for fun. He fulfilled that need by teasing kids, wrecking things, and stealing. He also had a need for power, and he fulfilled that by making people fear him (and by threatening a spirit bear, only to get mauled by it) He had a need for belonging, and he fulfilled that by bullying others and making other people laugh at the person getting teased. And finally, he had a need for freedom, fulfilled by trying to escape the island he was banished to in the story.
So it seems pretty obvious othat Cole is a bully, right? Well yes, but after he gets mauled by that spirit bear mentioned earlier, he nearly dies and goes through a journey of self-realization.