Geez, I might have to get me one. :-}
Some folks who grew up with firearms or were in the military or taught by those in the military understand firearm skills and safe firearm handling. If you don't seek training.
However, few outside the law enforcement or legal profession understand the laws that govern the use of firearms and how you can get yourself into serious legal trouble trying to use “common sense” in your defense, when court cases are about legal precedents and legal technicalities.