And yet you post as AC, huh?
It's less about being scared of the alleged 'boogie man' than it is about being realistic. Alot of things can happen when the average police response times between 5 and 10 minutes [http://www.bjs.gov/content/pub/pdf/cvus/previous/cvus107.pdf]. Assuming an AK-47 is makes for the best defense ever is absurd. A moderate caliber handgun (between 9mm and .45) is sufficient for protecting oneself between the 911 call and the police showing up.
On the subject of being realistic, using an AK-47 for home defense is just dumb. A 7.62x39 bullet has way too much penetration potential! You run the risk of shooting through both interior walls, some exterior walls, and into neighboring structures.