You can keep your "smart firearms" to yourself. People who argue that "smart" firearms will keep them out of the hands of criminals obviously have never dismantled a firearm before. The main elements that make a firearm are the barrel, the chamber, and the firing pin. You load a shell into the chamber, the firing pin strikes the shell igniting the primer and powder, and the bullet is expelled from the shell into the barrel and outward.
Safeties on firearms typically disable the ability to pull the trigger or to allow the mechanism to engage the firing pin. All a "smart firearm" can do is to build some complex mechanism that acts as one of these safeties. If I were to open up a firearm for maintenance I could easily remove the "smart" portion of the firearm and replace it with some normal "dumb" components. Which thanks to 3D printing and relatively cheap machining equipment could be produced at home. Criminals will still steal weapons, they will pay someone some money to disable the smart portion, and they will continue on their way.
Here are some other problems I see with a "smart firearm."
- Batteries, ok, now I need to change the batteries in my firearms before I can use them
- Fingerprint scanners are useless in states that have cold weather, ever hear of gloves?
- Fingerprint scanners are also useless in most cases if your hands are too dry from things like woodworking, or a number of other hands on trades
- RF Bracelets? Umm... ever hear of RF jammers? If I'm a criminal and I want to rob people all I have to do is get an RF jammer that works on the approved frequencies and I suddenly render all firearms (except my own hacked one) useless. (If you want to point out that such jammers would be illegal I'll point you back to the fact that criminals don't follow the law.) And, I guarantee you the police will demand they can jam the frequency so the tech will be out there and it won't stay in police hands.