Obviously we need to change something, but what? Arming more people? Just because what we're currently doing isn't working, that doesn't mean that there's only one other answer - arm everybody.

Sure, it's possible that someone with a weapon could have stopped this, but that doesn't logically lead to the idea that arming more of the populace will lead to less gun deaths.

It could be that arming everyone may lead to an occasional save, but would overall increase gun violence. To me that seems to be the most likely outcome. You may disagree, but we don't know the answer do we? And it's not like we can take back all of those additional guns if it turns out that you're wrong.

Saying that arming more people would lead to less deaths is like saying we should give nuclear weapons to all countries to prevent war. Would anyone support a policy like that?

I don't know what the answer is, but I do know that arming more people isn't likely to be it.