The nice thing about a shotgun is the shot doesn't go through multiple walls. You don't kill the people sleeping in your home. Also, someone breaking in is going to take one look and decide you can't miss. Oh, and if it's a crook and you know it is, don't say something like "Don't move or I'll shoot - because crooks don't understand fair play. When he hears your voice, he'll shoot.
I agree with everything except that sheet rock is "air".
It stops next to nothing. Do not depend on this concept when picking a shot package or round to fire.