I have a good friend who runs a small business. His home is within walking distance of his shop with an alley separating the two. In recent years, the summer months have presented an increasing problem with vagrants hanging around in the alley, the sidewalk out front, and occasionally coming into his shop. Often, they engage in unsavory behavior, litter, use illicit substances, or represent a danger in other ways. He and I have spent a lot of time discussing his frustrations, the fact that he is forced to carry a gun to and from work, instances when he has had to call the police, times he has...