I prefer "You're an idiot, get away from me, go save the planet by killing yourself!"
You cannot speak to the anti-gunners in any rational way. They are driven by emotion and cn't be swayed by logic. Tell them you are going to mark the curb in front of their house so the lawlless hordes/zombies will know where the easy pickins are.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball