Many people do purely use these cars for no purpose besides them being a status symbol, or to be more secure on the road (which could be suggestive of a non-confident or bad driver).
The roads are getting more dangerous and the climate is taking a bigger hit as a result of these cars being on the road. I'm sure once in a while they're useful for transporting things, but that point fails to come across when the bulk of the time that isn't the case, and it's just one person in an otherwise empty SUV driving to work.