So, I just had an experience reading a book that might speak to the several questions in this thread.
It's the first book I've read in one sitting in about ten years. I ran across it at a library sale, though it's a recent publication, 2012 is the copyright date.
The title is Billy Lynn's Long Halftime Walk, by Ben Fountain. It won some awards and got good reviews. It's described as a debut novel. I picked it up for 75 cents because the voice on the pages I read sounded true enough to intrigue me.
It's about a squad of soldiers on leave from Iraq, who've been heroes in a firefight over there and are being given the grand treatment, sort of. That includes being hosted to the Superbowl and participating in the halftime show.
Told from close 3rd POV, it's a guy book most definitely, no punches pulled, but so gorgeously done I drank it up.
I really don't like football. I worked to oppose the Iraq war, and supported efforts to offer soldiers a way out, even. I'm telling that because it factors into the plot of the novel; a sister pressures the MC to go AWOL and let this group help him escape.
What happened to me as the reader was this: I was so deep in identification with the MC's point of view that not only did I understand his decision to go back to the war, I wanted him to in the same ways he wanted to.
I got it.
I have no idea if the novelist wrote this to make a political impact but I doubt it. I believe he wrote it to get that deeply inside the heart and mind of someone in his MC's shoes and convey what that's like.
It did cause me to revisit those days when I hoped to convince soldiers to stay out of the war, to take advantage of opportunities to do that. Not in a way that would change my decisions, if I had that situation arise again, nor in a way to make me feel what I did was in any way wrong; what it did was deepen my sense of the nature of the times and the immense stresses placed upon those who fought, and who fight these wars.
The change is one of (I believe William said this) an incremental increase of empathy. Or compassion, perhaps.
Books that don't grab me like this one did, I'm not all that interested in anymore.