I need more facts before I call it un-justified. The presence of weapons (BB guns and firearms) contributed.
Has anyone thought about the fact that we used to prohibit armed officers in our schools? This will be litigated for years. Bottom line: teach your children better conflict resolution than taking a (bb) gun to school. Zero tolerance will bring more of this.
So long as the facts do come out, I'm perfectly agreeable to seeing it your way. :-)