No no no no no.............. How is it my responsibility to assume liability for another person's action? So I sell my buddy a gun. He is a proper person who later makes a bad decision.
if you knowingly give car keys to a drunk individual, the courts have held that you ARE liable for another persons actions. So, by NOT doing this type of limited background check, and you deliver a firearm to a mentally unstable person who uses it in a crime, you don't think you would not bear any responsibility?