That it was inspired by Les Mis doesn't mean it was meant to be exactly Les Mis. Les Mis may have led to "We should do revolutionary France", which led to Galt.
Les Miserables would be more postrevolution as far as I can tell, but maybe it was the the reason for including something France-like and then someone thought that the revolution would be more interesting.
You changed two important details; instead of (white) humans, hobbits, elves and dwarves, you now have Nubians. And instead of orcs who could walk around the real world on Halloween or at a con no problem, you have giants who are distinctly inhuman.
You only asked for the good races to be dark-skinned. The only good race in my idea are black humans. You asked for the villains to be pale-skinned, that's also satisfied (and I wouldn't have a problem with Transylvanian vampires, Viking plunderers or whatever either). Tolkien originally wanted to create myths for England, so obviously people in Middle Earth looked like Englishmen.