Hi Hai-men. Welcome to PT!
I had started a conversation on this in the "Tolkien's 'hidden' influences" thread. Here's a little of what I said. I agree with you:
I think it's difficult [u]not [/u]to compare the two. Critics often disregard the authors point of view when comparing and contrasting works anyway. Not that I say it's a good practice, but Tolkien obviously used Nordic traditions in his works, so comparing it to other works influenced by Norse mythology is not unusual. Besides the fact that Ring des Nibelungen, a work completed more than 40 years before Tolkien's work that involved giants and dwarves and a struggle for a ring of power is not an uncalled for comparison.
Just to expand on this a bit...once an author publishes a work many interpretations can be conjured, for the work is no longer a part of the author's mind, but a part of the mind of the collective community. People will make of works what they will. As for Wagner and Tolkien, there are many similarities and Tolkien may have been annoyed, but due to historical and reader criticism, these interpretations of the work are going to exist whether Tolkien intended them to or not. Author intention is often expelled from modern literary theory and criticism.
So...what I am saying is, thank you for the interesting articles, and yes, in my mind, if you can find the evidence directly in the text of the work to support your views, then feel free to interpret it that way! The author himself, whether he intends it or not, often has a difficult time extricating himself from his surrounding historical context and political views, which means he is often influenced in spite of himself.