Exactly. But it does and it (probably) doesn't think too much about it.
But it is presumably equally beyond the comprehension of the damselfly why you cannot fly, and for a dog why you do not have a similar sense of smell, or for a raptor why you don't have acute vision or a bluebottle why you cannot smell rotting flesh from miles away, or a fish etc.
But I doubt if any of them, like Shakespeare, fret too much over it and is it not a trait of human arrogance that we think we should understand everything rather than just marvelling at the mystery?