THE SOUND OF A LOUD THUD STARTLED CLAIR JONES, interrupting a quiet December night in her ground-floor Salt Lake City apartment. Something had hit the sliding glass door in her living room. Another thud, and her mind started racing. Was someone breaking in? When it happened a third time, she started yelling at the door: “I have a gun, and I’ll use it!” What she heard next was the sound of children crying—the ones who had been throwing snowballs at her door and thought she was going to shoot them.