How much easier can it get than entering a building, locking the entry and exit points with chain, and opening classroom doors to massacre at will? This incident may not repeat, but it will surely rhyme with another one in the near future. Unarmed populace is a sitting duck to psychopaths.
Don't go to parties with metal detectors
Sure it feels safe inside; but what about
all those n****** waitin outside with guns?
They know you ain't got one...
-Chris Rock.
Oh....I like that!