Do you bully people? why do you do it?

im no bully but i can tell you why a person bullied me and others.
my bully in my 6th grade do the bullying to me because i have a twin brother or he just want me to be his victim.

the bullies do it because sometimes they are jealous of a certain person that has something special that the bully don't have. or they don't like the person's appearance, religion, race, voice, personality, etc.

ever heard of a student in honor classes got bullied because his first name is Osama like Osama Binladin the terrorist?