For some reason, a scene from The Stand came to mind. The bad-guy faction had set up shop in Las Vegas, and some new arrivals (spies from the good-guy faction in Boulder) ran into a police-officer helping run herd on the Strip, noting that in a post-apocalyptic world, this was an oasis of order. This Wikipedia write-up notes his name as Barry Dorgan-
Although he is an ally of Flagg, Dorgan does so only because he thinks Flagg's world is the only society with a chance of regaining a sense of law and order.
Order is attractive, but it isn't always good, especially when the Big Man in Vegas was a charming but demonic figure. His name was Mr. Flagg, Randall Flagg. The cop mentioned seemed to not be some sort of devil worshiper, but merely looking for order in a disorderly world, and was thus willing to rally around the Flagg regime.
A Vegas guy living in the penthouse of a casino promising law and order, Mr Flagg. Interesting