So let's say you 'win' and get every single last one of those scary assault weapons out of the US. Logistically impossible of course but let's just say it happened. Then the next Nicholas Cruz goes into a high school with two Glocks and a backpack full of magazines. Kills 20 kids. Will you march for armed security then or will you march against handguns?
If the magazines only hold 10 rounds or less, they would have had a lot better chance of stopping him when he reloaded.
Who would stop him, the cops waiting outside the school?
And what if he has two more guns on holsters on his hips, and two more in a back pack?
If seen some crazy videos of a guy reloading those things so quick, if you blinked, you would miss it.
I really don't think you know what you are talking about.
He's only got 2 hands, which means he can only carry 2 guns available to shoot at a time.
As far as reloading? Yes, if you practice a lot, you can get to the point where you can run out, drop the magazine, and reload another in about 1.5 to 2 seconds, but that is only after a lot of practice. I learned how to do it while with the Security Forces while stationed at Newport RI, and we carried 9mm on patrol.
But, I doubt your typical school shooter would invest the time on the range to get that proficient.