Bully is a documentary that not only follows bullying victims; it gives us a look at their whole environment -- parents, other kids, teachers and communities. We see there's no single cause of it, and that it can't be solved one kid at a time.
When you see what Alex endures on a daily basis and imagine yourself in his shoes, it becomes starkly evident how bullying would make any kid want to avoid school or do something even more drastic to end their suffering, and why it's vital that we make our schools bully-free environments.