Drivers who don't even realise it is dark and STILL haven't got their lights on. Sure they leave work when it's heading towards dusk, but by the time they are half way home, it's dark, and can't been seen.
Or they leave a brightly lit street, it's raining, and it's bright enough that they can see OK, and too much rain reflection that they don't realise they're lights aren't on.
But FFS, cannot they not see the dashboard is dark - do they never check their speedo or fuel gauge ?
At least twice I've signalled to drivers to put their lights on whilst driving / crawling along the motorway within the last couple of weeks
I think given the rarity of this (I hardly ever see cars without their lights on) it is unworthy of inclusion here.
I trust you have never done anything wrong while driving or that would make you what you named these drivers. I doubt they do this intentionally.