Some people will argue about anything. Roberts admits that his interpretations differ entirely from Tolkien's understandings, and Vink that she is reading back motivations into Tolkien's writings that are hers and not his.
This hardly encourages me to view either of them as authorities on the subject of his racial inspirations.
I rather think that you are, in fact, commenting!
Tolkien's racial stereotyping, his colonialism, his imperialism, and his love for a non-existent pre-industrial idyll are all the result of his time and upbringing. Regrettable, but so it was.
As for some things being simple, I think one can do no better than to turn to the towering genius H L Mencken, "For every complex problem there is an answer that is clear, simple, and wrong."