Campfires on the Deck of the Pool?

Saturday night right at dusk as I was awaiting Mike to head back down and home, I turned away two visitors hiking their way up to the springs with larger than normal backpacks . . . campers. When I confronted one on the BPA road and informed him he was on private property and didn't he see the sign on the side of the road, he was ready with his excuse. He said 'but I thought this is forest