Since you've decided to take hypothetical mindset of a criminal trying to "sneak up" on people I'll do the same exercise with my made up extremist reasons regarding Golden's hypo.
I would take my kids inside because:
1) Because people with guns, much like people in general, can be idiots. And this idiot has an instrument that, unlike a knife, allows him to kill quickly, efficiently, with minimal effort, and at a distance.
2) Because someone about to go on a shooting spree doesn't care about resistance from cops or having their legal ducks in a row.
3) Because someone with a gun who carries is more likely to "be a hero" and attempt to stop a petty criminal himself, which leads to accidental injuries and deaths.
Look, I'm mostly for gun rights, but don't pretend like adding a gun to a situation doesn't introduce a potential for a quick and immediate death. That's my only issue, when gun rights advocates take their stance to the point of looking ridiculous. If I see someone with a gun, I don't assume they are a criminal, but it puts me on edge. Because they are carrying something that can immediately turn me powerless. (And I'm not going to argue the old shtick where you respond "and that's why we need guns! Because criminals have guns!" I'm simply responding to your response to Golden's hypo, and I'm calling it non-normal in the extreme. Because most people would take their kids inside, and when asked why, most people would respond "Because he had a gun.")