My copy of the book has a foreword by Le Guin where she said something along the lines of being very emotional about current day politics (current at the time of writing) when she wrote the book, and that she was not trying to be nuanced.

That set my expectations for the book and I was able to enjoy it for what it was. It probably also helped that I knew that writing style wasn't typical for her given that I'd read at least seven other books by her before The Word for World is Forest.