That point was addressed. By having a driver’s license and ready availability to a car in the driveway, the reality is the woman will more readily and more frequently be going for a spin around town even if it isn’t an appropriate reason for her to be shpatziring outside according to the Shulchan Aruch, Rambam, etc.
Think of it like having a TV in the home. Sure National Geographic and PBS might have some kosher programming, but once you have access to everything, we all know the great risks.