Yes there is, it's crime. Street lights deter crime.
Also simply driving safety. Driving with just headlights causes more accidents than on a well-lit street, since visibility is so much worse.
I love to see the night sky as well, but I don't want to pretend there aren't extremely good reasons for street lighting, and those reasons aren't going away.
That being said, are there ways to reduce outdoor lighting of giant industrial parking lots, of stadiums at 3 am, or whole floors of skyscrapers when 99% of people have gone home? Sure. But at the same time, reducing nighttime lighting by 50% isn't really going to make any difference in sky visibility. It's more about not wasting electricity.
I'm talking mostly about urban areas though -- in rural areas where there's already a decent amount of visibility and the population is small enough that most roads already don't have street lights, then regulation can actually make a difference, e.g. banning always-on floodlights on people's driveways.