I would argue that daytime running lights is the cause of many cars driving without taillights. In the US, DRL are only forward-facing. Nothing rear-facing is illuminated.

Drivers that have switched their headlights to the off position, the DRLs are "bright enough" to drive and not notice your headlights are off.

I see them very often, and for some reason a large portion of them are Hyundai. Maybe because the dash light, button backlights are independent of the headlights, so there's no real indication inside that your lights are not on, except the switch position.