Morning Scepticism: ETI

While I think fine-tuning gets causality backwards, let's grant the principle that the laws of physics are that way because they support life. What can we say about how those laws came about? While many people might invoke the supernatural, there's a perfectly natural explanation at hand. What about an advanced life-form in a different universe that arose under different conditions which in turn created our universe for the purpose of making carbon-based life? From our vantage point we couldn't distinguish between a divine creator and an alien one, hence that even if the argument is taken at its own value cannot get to where some people wish it to take them.