Once you take this path, you can make up anything that you like. There's no way to test it. Except, I suppose, based on how you feel about it, how well societies work whose members believe it, and so on.
I agree with this. There are similar arguments that you cannot prove reality is real. Sure, but how does that help us solve the energy crisis or world hunger? It is philosophical musical chairs. Aristotle and Plato investigated how to live a better life.