Gunholding while on the phone?
Given a car can kill both the occupant and other road users (sometimes even those off the road) I think it is more than reasonable for the authorities to ban the use of distacting technologies while cars are being driven. How happy would you be if people with guns were having a chat to their mate while waving a loaded weapon around?
Given the 3000 fatalities directly attributable to technology use while in control of a vehicle, I think there is sufficient justification for the ban. I would be interested to see if there were that many firearm fatalities in the US for an entire year. If there were the anti-gun lobby would be banging down the doors of Congress. If people can't behave responsibly while in control of a vehicle then the legislators need to protect the public and even the idiots.
Remember, a key in the ignition is like putting a round in the chamber ready for discharge. If you want to kill someone, maybe yourself, then go ahead but don't involve me in your fatality!
