So 12 people get shot up and it's a tragedy.
There's a death every 13 minutes because of a car accident, but nobody seems to want to talk about the cars, speed limits, road/car safety, etc. nor shed any tears.
God only knows why shotguns and AR-15's are even legal to purchase in this country, for what purpose? To wart off a zombie apocalypse? Prevent the NSA that is going to take you away in a white van in the middle of the night?
The only people that need guns are people involved in the narcotics and police, it's still a war out there.
Keep gentrifying cities and pushing the middle class to the poor class. Add access to buy 1000s of rounds of ammo with guns and you are going to see more people getting killed.