Most people in cities don't have cars at all. They use public transportation or ride sharing. Parking a car in a city is expensive, especially since you need to park it both at home and at your destination.

Cities are full of cars during the day, but the parking lots empty out at night. They live in less-dense suburbs, where it's comparatively easy to park and comparatively easy to have a charger installed. In the city, many of those who are willing to afford a car at all will also find ways to charge it (including sharing a few charging stations at their garage).