Make better adaptations

Inspired by Apocalypse Now.
We need to start making movies worlds of their own. Especially in adaptations of books. I hate being able to tell that a movie is an adaptation... because then that's what I'm thinking about the whole time. Then when something is out of place, I can simply say "oh, it's a line from the book. They just put it in. Not everything from the book can be explained in the movie". This is terrible.
Think about Apocalypse Now. The two books on Kurtz's desk.... they don't mean anything with respect to the movie. They're just references relating to the book. So the viewer tries to analyze this.... fruitlessly. Same with Kurtz's final words. They're from the book, and they're quotable, and seem deep, but they have nothing to do with the movie. They're out of place. Just keep a movie within itself....
I'm not mad, but I mean what I'm saying. It is truly lame when screenwriters just defer to the book for answers when they should be writing lines of their own that make sense within the movie. That connect to the viewer who's only seen what you just showed him, not every in-between line in the book.