Well, sorry, but that argument doesn't hold water. Just because something doesn't say no, doesn't mean it is a willing participant. When something is unable to speak for itself it need others to speak on its behalf. Willing means acceptance and agreement - spoken out loud. Nature cannot really speak, so you cannot determine whether it is willing or unwilling. That is up to each individual's ethical and moral beliefs to decide.
I don't exactly remember the arguments in the book, but it seemed, as far as I remember, to go for the rights and wrongs of the technology and the use of the technology. I just seemed to think it was made very trunkated and blunt in the movie.