A friends Mom's house got broke into a few years ago and she asked the investigating officer the same question about a gun for home protection. He told her don't waste your time with a hand gun. He told ger get a 20 gauge shotgun. A burglar is more apt to flee at the sight of that shotgun due to the greater chance of the owner scoring a hit! You also reduce the chance of incidental injury to your neighbors if you have to fire it. A 9 mm can travel quite a distance through your window and do damage down the street compared to a shotgun. Who knows