Just because gun license wouldn't solve every single edge case doesn't make it a bad idea.
>If we would get something similar with firearms licenses, there would probably still be too many firearms to help stop the glut of firearms.
A tax and mandatory insurance for gun ownership could also be imposed like with cars. This would mean that people with licenses wouldn't want to deal guns to unlicensed people because they would still have to pay for the insurance and tax on every firearm they own.
Even if current gun owners were grandfathered in this would at least slowdown new gun ownership and obviously inherited guns would follow the new scheme.
How to load, clear, hold a gun; familiarity with different types of gun and ammo; laws and regs. I still see people doing dumb shit at the range, but generally less than when I lived in the US.
By law you don't need a PAL to get ammo or parts, but most stores around here (I'm in AB) require it for any sort of gun-related purchase.
If we would get something similar with firearms licenses, there would probably still be too many firearms to help stop the glut of firearms.