>I have resisted getting into this discussion and I doubt that I will change your mind, but it's obvious that you don't know much about guns and even less about killing people.
>In my younger days the Army taught me about guns and killing people - guns or no guns. They then sent me to RVN for 2 years for practical application of what I had been taught. Later in life, sometimes on Army active duty and sometimes as a contractor, I taught soldiers and marines, from privates to general officers, what I had been taught and what I had learned from experience.
>Without going into details which might be of benefit to the wrong person, I would say, as relates to school shootings, that:
>1.Banning semi-automatic weapons would do almost no good unless you ban everything except single round weapons.
>2.Turning a semi-automatic weapon into an automatic weapon makes the weapon LESS effective. Did you know that the US military stopped buying AR15/M16 type weapons with full automatic capability 35 years ago. They do have 3 round burst capability but anything after the 3rd round was found to be basically a waste of ammunition.

You are totally correct for shooting in ranges occurring in jungle or street/house combat.

For the particular scenario of entering a room with unarmed/unsuspecting groups, full automatic of light guns (Uzi comes to mind) turns into a near short range weapon (say scythe or saber with a 5-15m arc) where not hitting at ranges below 10m becomes improbable.
Solitary pistol holder might have trouble stopping concerted rush of 3-5 men if they start from area close enough even if packing heavy slugs. Charging into a burst from an Uzi will mean **each** man has to overcome a few bullets with antagonistic inertia.

Yes, a gun is not an infight weapon and such ranges should be entered only when opponents are somewhat hampered like lying down or kneeling, but school IS a different scenario from shooting across the river/street. (I was in military, but only for prescribed term, saw no real action, but had a bit more training in these areas compared to the crypto/messenger nerds usually in our branch)

Encountering Uzi-style weapons in terrorist motivated traffic stops 40 years back made me even more friendly, asking police to point first to somewhere besides the car - they had a slight tendency to go off and then not pointing Uzi directly at target was good. Sweeping across or in circle was fast enough if so desired ;-)

There is also the fish in a barrel scenario in the first minute when shooting into a crowd from music/sports event. Wasting ammunition becomes unlikely when hosing into a herd...