Because a god wanted all but Kal to die. Despair of the Endless (the first one) had the star go supernova and destroy the entire planet except for a single survivor who would spend the rest of his life angsting because he was the one survivor. Of course, the whole angsting part didn't go as planned, and neither did the lone survivor part.
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Is this New 52 canon? I've never heard this before. Then again, I barely read the New 52.
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I don't know if Sandman is canon in the New 52, but that is where it came from.
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I hear DC is trying to get all of their franchises, including the Sandman and Lucifer, into one main universe. If that's the case, yeah, I'd imagine Sandman is canon.