The murdered children were under the custody and care of the school in general and specifically, their teachers. It was their legal responsibility to protect and defend those children. That responsibility is termed "in loco parentis". It cannot be shifted.
The school and teachers chose to not be able to protect and defend the children in their care by disarming themselves. And they attempted to shift responsibility to a law enforcement officer who was not in loco parentis to those children.
Again, that responsibility cannot be shifted from those in loco parentis (school & teachers), to law enforcement. Police forces have no legal responsibility to protect. In schools as well as out, their responsibility is to enforce the law.
The failure to protect and defend those children resided with the school and teachers involved. Tragically, the Deputy's failure was not protection, but procedure.
That's the difference in responsibility. And it's one our public schools, which are government entities, are doing a good job of denying.
‘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...