No one ever pretended that shopping for anything is a rational experience. If it were would there be Fluffernutter? Laceless sneakers? Porkpie hats? Would the Chia Pet even exist?
It is a shock to us in the twentieth century to discover from observations science has made that the fundamental mechanisms of life cannot be ascribed to natural selection and therefore were designed. But we must deal with our shock as best we can and go on.