What about "marriage" has anything to do with "natural laws"? It's a man-made construct, originally based on economics. And until recently law has favored people who have access and are joined by this construct (think making emergency medical decisions, property law, etc.). How does that make more sense than allowing people to be with whomever they choose? Calling it "stupidity" just shows your arrogance. The good news is that YOUR viewpoint is the one dying out. Either through enlightenment, or entropy and death. Try choosing the former before that latter gets you.