You see them all the time down here. They usually have earphones plugged in and are running facing away from the traffic on their side as well. Thus ensuring their Darwin award.
Pedestrians of all sorts should be made to show a light on dark roads. The sensible ones do anyway.
Cyclists must have lights by law. I got done for it when I was a teenager. I received an official warning, and a conditional discharge, but a mate of mine who was done at around the same time was fined a fiver. A lot of money back then.