Conversely, in several pages, nobody has presented a REAL LIFE scenario in modern times where a person went back to his vehicle to get his truck gun to then stop a terrorist attack, or even a mass shooting.
Okay, here's two.
An extremist attack in the form of a beheading and attempted beheading (I don't think anyone is going to try and argue that he wouldn't have continued his attack and stabbed and beheaded more people if he wasn't shot) and a school shooting.
Both had to retrieve the weapon from their vehicle. One because it was a school and the other because he wasn't carrying a pistol even though he was a reserve deputy and for whatever reason wasn't carrying a pistol.
Principal With a Gun Stopped a School Shooter (*Click*)
“He was so cool and calm. I saw him shoot a kid, and he ejected the shell,” says assistant principal Joel Myrick. “He was walking along, thumbing fresh rounds into the side port of the rifle.”
Minutes later, Assistant Principal Joel Myrick chased Woodham down outside the school, held him at bay with a Colt .45-caliber automatic pistol he kept in his truck in the school parking lot. He forced Woodham to the ground and put his foot on the youth’s neck.
Muslim extremist stabbing and beheading halted by CEO and reserve deputy who had to retrieve his AR-15 from his vehicle (*Click*)
Personally I think truck guns are a bad idea due to the issue of theft unless in a rural environment, but many times in modern day America people have to leave their guns stowed in their vehicle due to laws where they can't carry legally.
Ever had to lock up your carry gun to enter a hospital, nursing home, courthouse, school or other building with a legally posted 30.06 sign? There you go.