As to the description of hobbits, and others, as "fair". I think that many today take that description out of context. Within the context of The Lord Of The Rings Trilogy, and indeed, any of Professor Tolkien's works, the word fair simply means that the person in question reflects an inner light, that is to say, truth and beauty. It's a reflection of their general demeanor, not necessarily skin tone.
As an example of this, in The Fellowship Of The Ring, during the hobbits' first meeting with Strider, after Barliman Butterbur brings the note from Gandalf, Sam is suspicious of Strider. He doubts that this is the Strider mentioned in the note, sighting the man's outward appearance. Frodo points out that a servant of Sauron would look fair, but seem foul. Strider then quips, "I see...I look foul and feel fair. Is that it? All that is gold does not glitter. All that wander are not lost."
Clearly, Professor Tolkien is referring to matters that go deeper than the skin.
He's referring to the spirit, not the outer appearance. After all, if the mere appearance, i.e., the skin tone of the "good guys" vs. the "bad guys'' was his point, then what of Galadriel?
She's tall, beautiful, blond, and, as an Nolder, fair skinned. But, she is also guilty of a dark secret. She's not all together good. Oh, she finds redemption, after rejecting the Ring. But, lest we forget, she was in exile. She did take part in the kin-slaying, after all.
Also, there are plenty of light skinned villains. Isuldur claimed the One Ring. Smeagal, a Stoor hobbit, murdered his cousin, Dheagal, for the One Ring. Saruman coveted the One Ring. There was Ted Sandyman, a hobbit bully. There were the Sackville-Bagginses, and, in Bree, ther was Bill Ferny. There were also the Dunlendings. The list goes on and on.
Fair isn't, for Professor Tolkien, a person's skin tone. It's the person's very being. They are fair in the Eyes of Eru Illuvitar. After all, only Eru can judge the hearts of elves, men, and all free folk.