The more guns sold in the U.S., the greater the opportunity for them to end up in the hands of people who will misuse them. End of story. Theft from stores with lax security is just one of the many many many ways that happens.

There are about 10,000,000 firearms manufactured for domestic sale in the U.S. each year, and around 50,000,000 domestic firearm sales. Wondering how guns get into criminals' hands? Well, that's the first number in the equation right there. The other number is the rate of loss to the black market, which can be lowered if we decide as a country that we actually give a crap. (Microstamp all new firing pins; require a background check for sales of ALL guns, ammo, and parts; shut down Armslist and similar sites; give the ATF the tools they need; set up a system of competency testing, registration, and renewal in each state, similar to cars; safe storage requirements; firearms loss reporting requirements; strict liability; etc.)

Never vote for a politician who isn't serious about lowering both numbers.