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OK, let's assume the only reason for the war was slavery. Is it worth 600,000 lives? Slavery ended peacefully everywhere else in the world, why was the US different?

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Obviously it was not the only reason, but it was sufficient. And yes it was worth it to end the practice of men enslaving other men and the children of those slaves.

From Lincoln's Second Inaugural Address:

"Yet, if God wills that [the war] continue, until all the wealth piled by the bond-man's two hundred and fifty years of unrequited toil shall be sunk, and until every drop of blood drawn with the lash, shall be paid by another drawn with the sword, as was said three thousand years ago, still it must be said 'the judgments of the Lord, are true and righteous altogether."