Turin and Maeglin?

[Inziladun]

Originally Posted by Andsigil

Maeglin, on the other hand, had no such regrets and died having sold his city to Morgoth just so he could satisfy his lust on his cousin.

Yes, that sort of "desire" has no noble connotation in Arda. Ar-Pharazon of Numenor went a step further, actually taking his first cousin to wife. Where that stood in place among his myriad sins is debatable, but it certainly didn't help him.