Because evolution is not science. Evolution is a natural phenomenon that would exist whether we sentient beings were here to ponder it or not (though, of course, it did produce us). Do you deny that? Science is the human endeavour that works towards explaining things. Evolution as a phenomenon is a fact, not a theory or a piece of guesswork, and only flat-earther types such as Pete attempt to deny it. The theory of evolution by natural selection, on the other hand, isn't true and can never be. It's just our attempt to explain the true phenomenon. It happens to be a damn good explanation, but it's not the truth and never will be. Truth is a fairly black and white issue. If you don't like my saying that evolution as a natural phenomenon (not the theory) is true, then you're saying that it's not true. Science is a quest for truth but can never get there (theories must be falsifiable, remember, and something falsiable can't be the truth). That's what I mean by the asymptotic quest. There's a sort of joy about that.

As for laws of science, well that seems to imply laws that are human constructs rather than explanations of the way things behave, as science is a human endeavour. Laws of nature isn't great either but it sort of removes that human imposition part of it.