"Past school-shooter"

The idea of the "future-school shooter" has long been present in our society, but what of the "past-school shooter"? We are used to the idea of the shy, quiet kid with the unknown evil ideas likely brewing in his head, one day to be on TV with people he barely knew saying, "I always suspected, because he was the type you never would've suspected, because you always," and on and on and on. . . .

But what about the past-school shooter? What about men who were the type that would've shot up the school at eighteen or so, but didn't? Couldn't get a gun, or lazy, or just cowards, etc.? "Because it was wrong." What about them? The ones who could've been the perpetual teenage girl's masturbation fantasy, but failed to die early, and now have to live in the decay of the unlikely pubescence surviving body?