I don't know man, if you give people that liberty, they'll take way to much advantage of it. Next thing you know kids will be getting shot by their neighbors trying to sneak into their own houses at night, or even better when Johnny goes to visit his girlfriend while her dads out of town, and her car's parked in the closed garage, and the neighbor blows his head off upon exiting the building.

It's a little extreme, but I wouldn't put it past some American to be in such a hurry to get his gun off, that they'd fail to realize who they're shooting at.