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No human being with the deliberate goal of maximizing their alleles' inclusive genetic fitness, would ever eat a cookie unless they were starving. But individual organisms are best thought of as adaptation-executers, not fitness-maximizers.
A toaster, though its designer intended it to make toast, does not bear within it the intelligence of the designer—it won't automatically redesign and reshape itself if you try to cram in an entire loaf of bread. A Phillips-head screwdriver won't reconform itself to a flat-head screw. We created these tools, but they exist independently of us, and they continue independently of us.
The atoms of a screwdriver don't have tiny little XML tags inside describing their "objective" purpose. The designer had something in mind, yes, but that's not the same as what happens in the real world. If you forgot that the designer is a separate entity from the designed thing, you might think, "The purpose of the screwdriver is to drive screws"—as though this were an explicit property of the screwdriver itself, rather than a property of the designer's state of mind. You might be surprised that the screwdriver didn't reconfigure itself to the flat-head screw, since, after all, the screwdriver's purpose is to turn screws.
The cause of the screwdriver's existence is the designer's mind, which imagined an imaginary screw, and imagined an imaginary handle turning. The actual operation of the screwdriver, its actual fit to an actual screw head, cannot be the objective cause of the screwdriver's existence: The future cannot cause the past. But the designer's brain, as an actually existent thing within the past, can indeed be the cause of the screwdriver.
