I ask the same question about people with severally over sized off road tires, on a jacked up truck, that has obviously never seen the first bite of a trail or offroad. If it ever got muddy it was because the dumba## got drunk and trenched his yard coming home from the bar.
They are as much or more of a road hazzard as anyone.
Come drive in New York, where the pot-holes make the road look like a moonscape, and there are always oncoming cars so hi-beams are never really an option, and you'll understand the desire for more light wherever you can get it.
What annoys me, is people who have misaligned lights.
Fog lights are supposed to cast a beam, with a sharply defined top, which slopes down, 4" every 20'.
I've seen many people with fog lights so low, that the driver's view of the beam is obscured by the hood, and others high enough to dazzle oncoming traffic.
The worst IMNSHO, are those people who put HID lamps into headlights designed for ordinary tungsten lamps, for that bluer, and brighter effect.
The problem is, that headlights are an optical projector of sorts, and changing the filament from longitudinal to axial, changes the projection to be much brighter in the corners, which is exactly where it blinds oncoming traffic. That much more worse than even those stupid cool blue bulbs.
I know that the sharply defined top of the fog lights can flash at oncoming traffic when hitting bumps, but because of DOT restrictions on headlamp power output, car manufacturers have more recently been working on tightening the beam output of headlamps, to keep more light on the road, and that ends up with the same sharply defined top in most new car's lo-beams anyway.
Besides, factory installed fog lights automatically extinguish when the hi-beams are turned on, so if you see that the fog lights are on, and are still seeing too much light, its most likely from their low-beams being up in the trees.