Worth pointing out that headlights (and tail lights) aren't just for your ability to see things, they're also for the ability of other drives to see you.

So, headlights are still needed in the city, even if the streetlamps are good enough to see the road, and even during the day.

Running lights help, but it's still easier to identify a car with two (normal, non-blinding) headlights on than one with just running lights on, and much much easier when compared against a car with no lights on at all.