I certainly agree that human behavior isn't an immutable law of the universe in the same way that, say, gravity is. But, at least to me, it seems that treating

I certainly agree that human behavior isn't an immutable law of the universe in the same way that, say, gravity is. But, at least to me, it seems that treating it as such gives us a pretty good model for how the world actually works and thus allows us to make accurate predictions about the future.