What connection between Goldberry and Ulmo?

[Bêthberry]

Originally Posted by Morthoron

The link was kindly provided by the Dark Elf, but I shan't hold it against you. *winks*

*The daughter of the daughter of the River-Woman bows to acknowledge the courtesy of the Dark Elf, as links, chains and other accoutrements of bondage, when held against her for study of effect, so do not become her*

There's one aspect of the Tom and Goldberry as nature spirits theory that I don't think has been addressed. When the Valar departed Middle-earth, they left it in Melkor's control. Sometimes Yavanna and others attempted to mend the effects of this evil presence, but their efforts were sporadic and did not extend over all of Arda. So, if Arda is marred, if Middle-earth is tainted by the evil and chaos of Melkor, does that not mean that all of the natural world is fallen? Nature cannot therefore be either neutral or positive, but must be something to be fought against, for fear of succumbing to Melkor's taint. And even with the defeat of Melkor, was this pollution repaired? I don't think so but perhaps there is some archane comment in one of the secondary sources that addresses this point.

So, if Goldberry (and Tom) are spirits of the natural world, are they part of this marring? The violence in ATB suggests as much, while the domestic peace of LotR would suggest something else.