If I recall correctly, Sean didn't say that he didn't believe in fighting for something, he said (paraphrasing here) that he didn't want to impress upon the boy that fighting was the only way.
I was a bit disappointed as well. I thought he'd come out stronger, given his appointment.
I agree with whoever said that the commentary on Two Towers was not as good as the commentary on the first movie. I can accept that people have different ideas about policy, but these guys (excepting John R-D) were just your typical intellectually shallow liberals, and really not worth spending too much time on.