The document discusses reasons why some children become bullies. It states that research has found several factors that may contribute to bullying: 1) A combination of size and aggressive personality, with bigger, more aggressive children more likely to bully smaller, quieter peers; 2) Exposure to violent TV programs, which by age 10 is thousands of acts of violence; and 3) Exposure to real violence, with studies finding victims often become bullies themselves from learned behavior.