And just how do you ensure only trained people would be the ones with the guns? How would you know whether they were trying to kill the other shooter or just part of his team?<quoted text>
Even one more gun, in the hands of a responsible citizen, would have meant there was ONE more death - the shooters - and less innocent deaths.
Being armed and trained means shooting, and hitting, the target - not shooting wildly.
One or two armed citizens could have ended this spree - BEFORE it became a massacre
"A coward dies a thousand deaths, but the valiant taste death but once", Act 1, Scene 2, Line 32, "Julius Cesaer", by William Shakespeare
Face it, you'd have every idiot pulling out their guns shooting at anything & everything.
I can guarantee there would me MORE deaths, not less.
Btw, I'm a 20+ yr veteran & lifelong hunter who owns a dozen guns and has a concealed carry permit.