We were camping way off the beaten path, but still in a network of Forest Service roads about 20 miles from the North Rim of the Grand Canyon this August. Dark, campfire going, and here comes a car up the "lane" back to where we were camped. They drove to the end of the "lane", about 50' away from us, and proceeded to set up their tent.
I wanted to go ask why they couldn't have stopped closer to the FS road, instead of setting up by us, but DW didn't want me to confront them. It turned out to be a couple in their 20s, based on the walking in front of their headlights while they set up the tent. I attributed their presence to either being young and oblivious, or they had a long, tough day, and were through driving.
But, they left before I finished cooking breakfast in the morning, so it wasn't too bad. Irritating, but short-lived.