'The Lord of the Rings and Philosophy'

[Eladar]

But Tolkien seems to be scrupulously fair when it comes to the bad guys. I cannot think of one principal bad guy in all of Tolkien's works who did not ultimately get his or her "come-uppance".

Looking at the other side of the coin, we do have a good guy who reaps nothing but sorrow, Turin.

Melian did nothing wrong, but she definitely suffered.

It is possible that some of the Nazgul were evil to begin and were rewarded for following Sauron. True, they ended up dead, but this was thousands of years after they should have died.