If you were a criminal, which home would you be more afraid to break in to: a home with a "Protected by Acme Security Company", or one with a "This house is protected by God and a gun. Come in uninvited and you will meet them both." sticker?
No one in their right mind would break into a home with this sticker on the window. And that's why we want to get it on as many homes across the country as possible. If criminals keep running into these, maybe they'll hang up their hat and call it quits on the whole criminal career thing. (Okay, that's not likely. But at least they will be much more reticent to break in to your home and harm you and your family.)