I am glad this discussion came up, I live in the state of the Petit family (well, at least the good doctor is still alive). I would like to get a gun but I am hesitant in a house with 2 kids, not to mention I am concerned an intruder could obtain the weapon.
Has there been ANY progress on the 'smart guns' (either biometric or even a simple RF tag device) being made available for the home market? If so, how reliable are they?
I have no experience with these, but I've heard of Magna-trigger before. You would have to wear a ring (that I believe is magnetic) and when you grip the gun, the ring turns off the extra safety. So, someone without the ring on, would be unable to fire the weapon. However, I think they are only available on certain firearms, not to mention having to wear the ring.
There are many fingerprint gun safes available though. This would allow you to have the firearm easily and quickly accessible to you or your wife, but not anyone else. As for keeping the gun out of any attacker's hands, I'd say it just takes training. The NRA offers multiple classes about self-defense handgun, and home defense with a firearm. A firearm is not the end all solution, but can be a great tool if you train properly.