My Thoughts on Bullying

I never understood why people find the need to bully others. Or why some people bully another so violently, that it sadly, even leads to suicide. I wonder what really goes through the heads of the bullies. What makes them want to harm another person verbally, emotionally, and or physically? If something about a person bothers you, leave them alone. Does that person really impact your life so much that you find the need to ruin theirs? I have never been bullied or found the need to bully a person. But, I have seen bullying being done before.