‘And they attempted to shift responsibility to a law enforcement officer who was not in loco parentis to those children.’
that is a very true observation...
My belief is that the main issue comes down to who is “in loco parentis”. Laws of the “several states” require attendance at public schools. That makes those schools and their teachers agents of the government. They are not elected officials or sworn officers. So sovereign immunity does not attach to them. But in loco parentis does.
Pursuing that line of reasoning, when under a teacher's direct supervision, such as in the classroom, that teacher is in loco parentis. He has the absolute responsibility to protect and defend the students under his supervision.
Further, when students are in general motion or assembling not under direct supervision, the school is in loco parentis. Once again it is the absolute responsibility of the school to protect and defend those students.
Schools and teachers should not be permitted to evade this responsibility. The sooner We The People understand this responsibility, the sooner we can truly address the issue.
One possible way to address it is to require firearms and protection training qualification to attain teacher certification. Then, further require that all public school faculty be armed while “on duty”. That would address responsibility, capability, and requirement of action embodied in loco parentis.
In that scenario, schools would not longer be happy hunting grounds for child murdering scum. Schools would become a death trap for wanna be child murders.
Would the education establishment scream about any of this? Certainly. But the first thing to do is to confront them with their legal responsibility to act embodied in loco parentis. Then solutions can be developed.