Thank YOU for posting this.
Here is the perfect solution.
Arm the bereaved parents. Send them to [insert your
favorite terrorist breeding ground here].
'Nuff said.
This will never happen at my school. The principal and the teacher are armed. The student body of four is too small a target.
At the risk of sounding cold and calloused, which I'm not. For your children's safety, remove them from public targets now and home school them.