Bullying is not just something that one does to another person. It's the social destruction of self that is mediated by a group:
https://www.amazon.com/Bullying-Social-Destruction-Laura-Mar...
Bullies couldn't do what they do if they did not have the support of the other students, teachers, administration, etc. As late as college I was harassed by criminally minded person who led a criminal gang that was not held in check until they finally smashed somebody in the face with a rock in front of many witnesses. Two people were driven to suicide.
The leader has been to prison and if he got out and went straight I could forgive him, even celebrate him, because it is so hard to get out of being justice involved. I'm still angry at the college administrator who told me "my hands are tied" who many see as a hero because he really did a lot of great things for our school -- but I wonder who else was driven to suicide and I fantasize about going to his funeral and dumping over his casket. An apology from him would go a long way, I've asked for it, I never expect to get it.
If you're being bullied in elementary school you don't get friends. It could be that the bullying drives away friends, or if you had friends you wouldn't get bullied, or the same deficits that cause you to get bullied also cause you not to get friends. Just being in a safe environment is a basic human right.