Whorehouses are legal in Nevada. The issue is not whether these businesses are tolerated under the law but whether or not they attract or increase criminal activities (such as littering of biohazardous materials and public indecency in an adjacent church parking lot). They certainly do at least attract crime, which is why most states have zoning regulations providing for protective, porn- and strip-club- free zones (e.g. 1,000 feet radius) around churches, schools, etc.
Perhaps the non-churchgoers would understand the issue more clearly if they saw the "church" as their daughter's high school, the parking lot as the school parking lot, those forced to see the naked bodies of lecherous men as the schoolchildren, and the school principal as the one who had come up with the postcard idea after state officials ignored repeated requests to clean up the vice.