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I am not a scientist, but it seems to me that light speed was mesured. Then why this constant and not another one: because it is a reality. Why do we constate that sun rises in east ? because it is a reality. Now, universe obeys laws. Why these laws and not other ones? It is up to an astrophysicist to answer. – morgankane01

Why these laws and not other ones, is more of a philosophical question. How/What this laws work/are, is the physical question behind it. Knowing the laws allowes for a better understanding. The sun rises in the east, a reality, but it does so because the planet rotates eastwards.

Lightspeed in itself isn’t a law, it is the result of such.