This is heartbreaking.
Parents of young children should consider home-schooling.
We have to have all schools whether they are public or private locked down better than most currently are.
We need, and should demand, layered protection where it would be so difficult for a crazed shooter whether it's a student, or some mentally deranged person, to break through that they would either not even try, or would be stopped.
Our country is never going to be disarmed, the right to bear arms is woven throughout our nation and laws. So please get over it!!!!
Once you get past that FACT, you must consider then that the only way to stop school shootings, is to make it very difficult or nearly impossible for a shooter to succeed.