The Parkland mass shooting & the "good guy with a gun" myth

Gun-loving people think having a gun means they'll be the hero (like in the movies) & they'll quickly kill the killer or "bad guy with a gun". But when you're facing a "sicko" with an AR-15 which has the capability to literally blow your head off, tear your arm off, or shred your inner organs, you know it's not that easy. 

The "Atlantic" has an article about what the doctors (who treated the Parkland victims) faced: 
https://www.theatlantic.com/politics/archive/2018/02/what-i-saw-treating-the-victims-from-parkland-should-change-the-debate-on-guns/553937/

"I was looking at a CT scan of one of the victims of the shooting at Marjory Stoneman Douglas High School, who had been brought to the trauma center during my call shift. The organ looked like an overripe melon smashed by a sledgehammer, with extensive bleeding. How could a gunshot wound have caused this much damage?

The reaction in the emergency room was the same. One of the trauma surgeons opened a young victim in the operating room, and found only shreds of the organ that had been hit by a bullet from an AR-15, a semi-automatic rifle which delivers a devastatingly lethal, high-velocity bullet to the victim. There was nothing left to repair, and utterly, devastatingly, nothing that could be done to fix the problem. The injury was fatal."

Helping propagate the myth, Trump & the N.R.A. keep going on & on about a "good guy with a gun" who would've hypothetically stopped the Parkland murderer. They fail to mention there was indeed a "good guy with a gun" at Marjory Stoneman Douglas High School & he, in fact, did not stop the killer. More than likely, he heard the devastatingly loud rounds from the AR-15, and he froze in fear:
http://www.sun-sentinel.com/local/broward/parkland/florida-school-shooting/fl-florida-shooting-sro-20180222-story.html

"The police officer assigned to Marjory Stoneman Douglas High School resigned Thursday, under investigation for failing to enter the building as a gunman opened fire and killed 17 people.

Sheriff Scott Israel said Deputy Scot Peterson should have “went in. Addressed the killer. Killed the killer.” Video footage showed Peterson did none of that, Israel said."

And this was a trained officer who was frozen with fear. So the question is, what can you expect from teachers who just want to educate young people & who didn't sign up to engage homicidal-suicidal psychopaths who are armed with high-powered rifles.

What the solution to mass shootings is, I have no idea, but I know it's not more guns. There's already more than 300 million weapons in the U.S. (personally, I have an uncle who has an arsenal at his house), so no, more guns is not going to solve the problem.