We know why. It happened because guns are too available in this country and we need common sense gun laws like no guns in the hands of civilians, ever.
(Please read the tagline.)
YES! Yes! We need to disarm just like Europe! You NEVER hear of moslem attacks in France, do you?
Or Spain
Or England
Or Canada.
Or Kenya
Or India
That’s because they have (trumpets and flourishes) GUN CONTROL!
Snark Sarc: