Think I'd be okay with other drivers just having their DRL on during fog/snow/rain, since it usually adds at least some visibility, but unfortunately, the dumb car manufacturers neglected to make the rear park lights mandatory as well.

The idiots that drive in such conditions without even their parking lights on or with DRL fronts illuminated only are very difficult to see.

Jmo, but at a bare minimum the law should allow for parking lights with always-on DRL or full headlights required without DRL in shitty weather. Though "headlights on" is stated more simply and a bit safer, but adds confusion for the people not realizing DRL is front lighting only.