A whole classroom just wiped off the face of the earth.

[Model35mech]

12. The value of that is it is brief to the point

It's also convenient in being a popular explanation.

The presence or not of the gun is absolutely a critical control point. The same can be said of the bullets. Or the finger of the hand of a person with intent to shoot the gun at school children...

Control at critical points is how system regulation works, but banning these guns from sale to legal buyers has proven very difficult politics for near 30 years. If that's what you want to hang your hat on, go for it. No one will stop you and most people (me included) will at least wish you better luck than previous attempts at that.

Within the system of things that are involved in a legal sale of a gun there are multiple other controllable events. You probably would do better to consider regulation of one or more of those things than bans on the gun itself. The second amendment does suggest guns should exist in a well regulated environment. Something in that vein might someday get past SCOTUS.