A number of things need to be said about this event. The first is, don't emulate the media morons by wringing your hands and asking why it happened. This was a psychotic crime for which, by definition, there can be no comprehensible motive. Notice that I'm not saying the killers weren't responsible.
Psychotics talk themselves into their psychoses with a staggering dedication and persistence.
I wouldn't trust public school teachers to tie children's shoes, let alone defend them. Following a background check, of course, along with a hearty fingerprinting, a rousing urine test, a robust rectal examination, and a two or three hundred dollar fine for daring to believe we're still Americans. It's just too good. Paragraph canceled due to lack of politically correct conclusion. One thing is beyond dispute.