I loved my Catholic Jr. High and High School
The brothers and nuns were merciless on bullies and cheats, and against any cliques.
We were all brothers in Christ, they said. And they meant it.
In a way public schools are hamstrung because the only reason to rebuke killing (through words or otherwise) is the sanctity of human life, and neither our society nor our public schools are able to give the bullies the only effective and true reason to treat ALL innocent life as sacred. The anti-bullying programs cause even more bullying because they are forbidden from giving the real reason.
Until our society figures out that the Bible really is the one worldview on which a just society can exist, people are gonna be the animals our whole society assures them they are.
I went to catholic school grades 1 -10. You had to be tough to survive the bullies.