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A radiologist who handled the Parkland cases discusses and describes the difference between a handgun (even a semi-automatic one) and an AR-15 in terms of the damage done when the bullets hit human tissue. His conclusion is that the difference is the possibility of survival.

One of my ER colleagues was waiting nervously for his own children outside the school. While the shooting was still in progress, the first responders were gathering up victims whenever they could and carrying them outside the building. Even as a physician trained in trauma situations, though, there was nothing he could do at the scene to help to save the victims who had been shot with an AR-15. Most of them died on the spot, with no fighting chance at life.

As a doctor, I feel I have a duty to inform the public of what I have learned as I have observed these wounds and cared for these patients. It’s clear to me that AR-15 or other high-velocity weapons, especially when outfitted with a high-capacity magazine, have no place in a civilian’s gun cabinet. I have friends who own AR-15 rifles; they enjoy shooting them at target practice for sport, and fervently defend their right to own them. But I cannot accept that their right to enjoy their hobby supersedes my right to send my own children to school, to a movie theater, or to a concert and to know that they are safe. Can the answer really be to subject our school children to active shooter drills—to learn to hide under desks, turn off the lights, lock the door and be silent—instead of addressing the root cause of the problem and passing legislation to take AR-15-style weapons out of the hands of civilians?

But in the aftermath of this shooting, in the face of specific questioning, our government leaders did not want to discuss gun control even when asked directly about these issues. Florida Senator Marco Rubio warned not to “jump to conclusions that there’s some law we could have passed that could have prevented it.” A reporter asked House Speaker Paul Ryan about gun control, and he replied, “As you know, mental health is often a big problem underlying these tragedies.” And on Tuesday, Florida’s state legislature voted against considering a ban on AR-15-type rifles, 71 to 36.

  The Atlantic

Marco Rubio was wrong.  A ban on AR-15 sales to civilians would have prevented it.

Clearly, the argument that guns don't kill people, people kill people, is untenable. You'll see that if you read the article.

...but hey, do what you want...you will anyway.

UPDATE 3/4: