Out in the country, you still don't really need brighter headlights. Other cars' headlights will always be visible and they have reflectors, so it's not as if you'll struggle to spot other cars. The road lines are actually reflective, so it's not as if you'll struggle to see the road lines. And generally speaking out in the country, there won't be pedestrian foot traffic, so it's not as if you need the bright lights for them.
So who are they for? I think broadly people may just not be able to avoid excess unless restricted by the facts of their environment. Allow people a plethora of calories, they'll get too fat. Allow them a plethora of entertainment, they'll drive themselves insane. And somehow .. allow them too many bright lights and they'll all just blind each other.