Your basic point is that the police should make the citizens aware that they are ultimately responsible for their own safety. Why everyone doesn't already know that is beyond me.
That's why it would be better to have a professional, and not me, handing out the instructions. :-)
If this person had decided to be a home invader instead of a sniper, he might have already been killed now. Within people's homes, where the liberal gun laws have not yet extended, it would be almost suicidal to confront what some people have stored in the nightstand.