The United States has some very rural areas where you can be the only vehicle on the road for miles. "Stupid" driving is safer for other people there than "smart" driving is in more populated areas.
But if you're not in favor of totally deregulating public roads in areas like that, then let's look at just the light situation.
Having a light out is much easier to notice than whether or not someone is wearing a seatbelt, and is also used by law enforcement to pull people over, meet quotas, etc.
If I don't have headlights, but your taillights work, I can still see your vehicle in front of me and avoid a collision. Likewise, if I don't have taillights, but your headlights work, either you should see my vehicle in front of you and avoid a collision, or you shouldn't be driving at all if you can't tell you're getting closer to my vehicle.
In both situations, the lights on your car are sufficient to keep you safe if I choose to be "stupid" and drive without lights.
The same goes for regulations requiring air bags, crumple zones, tempered glass windows, and other safety features designed to protect the occupants of a vehicle. If seatbelts are government overreach, then so are these. It's my God-given right to die as violently as possible in an easily-preventable accident.