It was the same way 60 years ago.
You take care of a bully. Fight dirty.
When a fellow classmate in my high school gym class threatened to push me down a flight of stairs for some unknown reason, I told the coach who, blessedly, believed me. She apparently took care of it. I never saw the girl again. The coach apologized to me and told me that the student was having problems at home. I told my mom decades later; I didn’t tell my parents then because I didn’t want to worry them, and it was resolved without needing their input anyway.
If someone is threatening to kill you, it’s not always time to play “show some spunk”.
It sure as hell is the schools job to protect children while they are on school grounds. And you calling an 11 year old girl, a snowflake because she was upset at being tormented by bullies is despicable.
In your world, schooler shooters did right.