My understanding is that the whole thing was a genetic experiment by a greater intelligence (a god if you wish) probably repeated throughout the universe. Two monoliths were left for earth-life to find. The first on the earths moon and the second on Europa (pointed to be the first). If earth-life had evolved enough to find the first they were pointed to the second. If the earth-life became advanced enough to get to the second then they were worth further investigation/saving. Humans only just got to the second in time to avert our destruction.
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