Vox has a look at bullying and how to stop it:
“If a bully is not helped with being a bully, that’s a mental health issue,” says Mary Gordon, author of Roots of Empathy: Changing the World Child by Child. If a child you know and love is the aggressor, read on for some expert advice on what to do next.
“As a parent, I feel so badly for the parents of bullies,” Gordon says. “There’s a feeling of, ‘I’ve done something wrong, I’ve been a terrible parent.’ Don’t beat yourself up. Don’t make this about you. You’re not a bad parent.”