Let's be honest. Any realistic outcome to this situation that didn't involve vehicular pwning would still garner bloviation from the peanut gallery.
1. The loser takes the gun and murders one or multiple civilians. "another day another shooting, ban guns." Cops track down loser and loser gets shot. "Couldn't they have just called a negotiator?"
2. The loser continues to meander around town firing shots, cops confront loser and tell him to surrender, loser points gun, loser takes dirt nap. "Couldn't they have called in a sharpshooter to shoot his achilles to render him immobile, then shoot the gun out of his hand?"
Bonus pie in the sky scenario - Cops go out of their way to use non lethal force, suspect is tazed, drops like a sack of potatoes. "that's harsh, couldn't they have just incapacitated him with a tranquilizer gun?".
Some people will never learn to just shut the fuck up.