How many people do you know who say “driver’s license” rather than “driver license”? Or “daylight savings time” instead of “daylight saving time”? While it’s true that some states do call their privilege-to-drive cards driver’s licenses, nobody should add the extra s to the time-change thing.
To carry this added-s-ness even further, there are those loathsome people who say Sierras. The mountain range is officially called the Sierra Nevada, shortened to the Sierra. One of the few times you can legitimately say Sierras is when you’re referring to more than one GMC pickup truck of that name.
In the central California community of Clovis, there is a neon sign looming over the main drag that was installed decades ago declaring Clovis to be the “Gateway to the Sierras.” There have been endless arguments ever since about the appropriateness of the added s. To resolve this morphological conundrum and still allow the Clovens to cling to their idiocy, perhaps they could modify their sign to say “Gateway to the deers, trouts and quails.”
To make themselves even more right, they could change the town’s name to Cloviss.