You can't ask the question "why" in the meaning of some kind of will or sense, idea... For example why the Earth is the ball-shaped? Because of the law of gravity. If you ask what is the purpose of gravity, that is not the question for science, because no matter what the reason is - the gravity still exists and has the same properties.
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Good point, by "why" I meant "what caused it" and to be clear, I'm not arguing for or against any theory. I'm just pointing out that we don't know all the answers so we should keep an open mind.
Bravo!