I like how this thread turned from being about a mass shooting to gun control to semantics and nitpicking. It's not smoke, it's tear gas. If the shooter could see well enough to pick off individual targets, some person in a given row could aim near the attacker without a civilian getting in the way because of stadium seating
The difference here is, the shooter in this case didn't give a crap who he hit. He could fire blindly into that smoke and be reasonably sure he's hitting people. Whether he could see through it himself is irrelevant.
There's nothing to be gained from simply slapping guns in peoples' hands. If more people were armed, it would have done nothing but cause more injuries.