So you don't care about the NEW nut job (usually not a criminal) on a whim going to the local store, getting a NEW AR15 and killing kids in school. Noted.
Turn in what guns? I want you to surrender your right to defend yourself? You can't do that with a shotgun? Or five shotguns? WTH is wrong with you that you think you need handguns and AR15s to defend yourself? Maybe you need medication to reduce your anxiety.
First, the shooter in Texas used a shotgun. So even if you got rid of the AR15s through some magical spell, you'd still have nut jobs committing killings. Second, as I've stated - defending yourself with a shotgun when the enemy has a semi-automatic rifle puts the defender at a disadvantage.
I also noted you ignored the article on children dying in Chicago. This is because you don't really care about kids, you care about getting rid of guns.
But you obviously have ways to surgically get around the problems this generates. And unfortunately, even if this is done, many times it doesn't kill the cancer... Gastric cancer is one of the most agressive cancers there is... But I repeat, in no way do I mean to invalidate your point. Which I agree with.