It's "funny" what you think falls into the category of "reasonably believes...would expose the actor or another to a substantial risk of death or serious bodily injury!"
Yeah, if he brandishing a knife or gun, then yeah, you can reasonably believe he might kill you. Absent that, not so much.
The real lesson is getting lost here: We have a right to self defense.
In the wilds of NYC, DC, Chicago, Detroit, et al, the bad guy is free to do as he will. In civilized areas, the right to defend yourself is recognized. Don't like it? Move to the wild, wild, inner city in a gun-controlled "paradise." Hey, why not put up "gun free zone" signs in the windows of your home? Better yet, wear a "sandwhich board" ad that says "gun free zone" instead of "Eat at Joe's."
That's a reductio ad absurdum almost as outrageous as your invocation of Bush.