Well, to be perfectly honest on this whole thing, there is no excuse for using a firearm on someone banging on your door or ringing the doorbell. In this day and age of ring doorbell cameras, security cameras and all this linked to your smartphone, you have the ability to see who is at your door regardless of the time of day or night. You have the ability to make a judgement call from the safety of your bedroom with that camera or security system. We have a security system with cameras at all outside doors or access points, which we have an app on our phones for. The cameras alert us to movement, even before they get into knocking/ringing distance. There are many ways to ascertain just who is at your door, courtyard, back yard, etc. And, I don't care where you live, shooting a fleeing person in the back is a serious NO-NO.