Yes, American cities should do more to control light pollution. For a long time humans have enjoyed observing astronomical phenomena and this enjoyment should be protected, as it inspires people to greater heights in both artistic and scientific fields. Further more light pollution can interfere with the work of amateur or lone astronomers who report findings to NASA.
Without light pollution, people can rest at night. Natural plants and animals have more of a chance to develop as they would in a natural environment. The night is so much more peaceful in a place with light pollution controls, because it actually feels like night at the end of the day.
In an era where Americans are concerned, constantly, with STEM (science technology engineering and mathematics), it is counter-intuitive that one of the easiest sciences to "hook" amateur scientists in on (astronomy) is virtually impossible to pursue in urban areas due to light pollution. By shutting off some of the lights and allowing everyday citizens to enjoy the beauty of nature, we will be promoting a generation of astronomers (and by association, space shuttle engineers, biologists, astrophysicists and geologists) that can push us back towards American exceptionalism in the science fileld.
While turning off lights in rooms that are not in use makes good sense, cities reducing or turning off lights to control light pollution is not a wise choice. Safety should be the first concern. Cities need to be well lit to keep people safe when walking on the streets or in parking lots. Storefront lights also provide additional security on deserted streets.