We can play the what-if game all day long.
The truth is, people died and no one could stop it because they weren't sufficiently equipped to resist.
So the next massacre, the same thing will happen, because again, people will not be equipped to defend themselves.
Each time, some mook will call for tighter gun controls, when it seems to me, the gun controls are working perfectly because each time the victims are disarmed.
And that is what you wish to believe. I believe that an armed public would have raised the bodycount. We each are entitled to believe what we want. I'm not calling for tighter gun controls. Like I said in a previous post, I don't live in the USA so your laws are your laws.