Anyway, yes, I do get to decide that we limit the rules of society to what can be experienced in the natural world. The conversation is absolutely meaningless if the "supernatural" carry any weight. There's no reason. There's no logic. Anyone can assert anything if that person claims he or she believes it hard enough. So yes, there a ground rules: we stick with what is demonstrably real.
Has nothing to do with a moral superiority--it has to do with wanting a rational conversation. The supernatural is by definition irrational. Again, in using that term supernatural, I do not concede in any way that any such thing exists.