Ok, that kind of makes sense. What about this question:

why would under ground water pipes do any good since they're so far down in the ground?
In his book, I thought Robert said that these negative entities favor towns over cities because of the underground water pipes in the cities keep them confined to certain areas. I would think towns would also have underground water pipes running everywhere. But in any event, aren't the water pipes a few feet in the ground - why would they have any effect on the entities? And when you're in a car driving around you can add another foot or two.