@Finn dAbuzz,
Some people are loony to the degree that they pose a threat to society and are often committed against their will. Who else but the government should have this power to decide? It's not perfect but I don't have a problem with the goverment having laws that are interpreted by courts that govern declarations of mental fitness for things like driving, having guns or even sometimes whether they should be committed.
If guns were just as regulated as cars there would be an enormous reduction in their use in crime (according to some studies up to 90% if we just do background checks and a few other things that don't go beyond regulating them to the same degree as cars) and homicide and that would take a lot of the argument for gun prohibition away.
I think gun rights activists see gun regulation as a slippery slope but I think they have it backwards, if they were to agree to just regulating guns to about the same degree we do with cars that would almost eliminate the argument to prohibit them.
It won't happen anytime soon, but this is what I recommend for the US:
1) To purchase or carry a gun (including purchasing ammunition) you would need a license, the test for the gun license is just a background check (gun safety like driving safety would be a great idea but not as important as just the background checks).
2) Guns are registered, like vehicles.
That's all. Guns are less useful than vehicles and we all put up with regulation of owning and operating a vehicle (much more regulation on the operating side, there are no fines for handling a gun irresponsibly).