You should watch the movie and get back. It has a pretty obvious agenda to me, and frankly I’d be surprised if the book doesn’t as well (but I haven’t read it). If the book had anything like a conservative message, I doubt the leftist American Library Association would be recommending it.
I read the book (working on #2 now). No apparent agenda, aside from whatever the reader chooses to impute upon it. Not so much a “conservative” message as a responsible libertarian one. It’s freedom vs. tyranny, not liberal vs. conservative.