“His idea of himself is that he wants to heal and rehabilitate Middle-earth. He’s got a very clear vision for how it should be done, and the only problem is other people keep on getting in the way,” he explained.

Just, no. No, no, no.

I am the Elder King: Melkor, first and mightiest of the Valar, who was before the world, and made it. The shadow of my purpose lies upon Arda, and all that is in it bends slowly and surely to my will.

That is a direct quote from Sauron's boss/mentor/etc. And on his ultimate weapon (the Ring) he engraved:

One ring to rule them all, one ring to find them, one ring to bring them all, and in the darkness bind them.

Sure, he really wants to heal and rehabilitate things.