While people out there on the spot certainly have to be held accountable for what they've done personally, the chain of command responsibility for this strikes me as just as important and should be dealt with.
The world is filled with violence. Because criminals carry guns, we decent law-abiding citizens should also have guns. Otherwise they will win and the decent people will loose.
You say that you are my judge; I do not know if you are; but take good heed not to judge me ill, because you would put yourself in great peril. Joan of Arc