Re: 'Smart guns' - an inherent failure
4. Methods that rely on proximity rather than a fingerprint would work with gloves. Some proposed methods are a ring. If your opponent can get that from you, they could probably take your finger as well.
5. If having a "smart gun" leads you to have an "accident' with your firearm, you should not have a dumb one either. Not a good argument.
7. If you don't properly maintain your firearm anyways, you won't maintain the "smart gun" feature. Not a good argument.