Madara asserted that his goal of a dream world in Mugen Tsukuyomi is a noble one. He wanted to create a perfect world, no war and no hatred.
But he told Obito that he dragged him to the "dark side".
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Which means he now admits that his goal is a wicked one. His side is the dark side.
Yet he thinks of himself as the savior of the world and vehemently criticized Hagoromo and Hashirama.