my journeys to work will be immeasurably less pleasant due to the carelessness/deathwish of another party?
Not having lights is not a "death wish". It may be cavalier, trusting, unwise, accidental, or any combination of these things and others, but it is not a death wish. People on unlit or poorly lit bikes are generally just hoping to make it home, the same as the rest of us. They might include children, novices, people who found themselves out later than they expected, people who cannot afford lights, people whose batteries have run out, people who have had their lights nicked, people who forgot to swap their lights from another bike, people who identify as pedestrians rather than traffic, people who feel indestructible (see children above), people who forgot that there was a section of the ride without streetlights, people who are trusting those driving more dangerous vehicles to take responsibility for them, and people who make the (entirely accurate) assessment that not having lights does not miraculously render you invisible. Just slow down and look where you are going.