When Ben confronts Jacob in the Lost season 5 finale, he asks Jacob,
What was it that was so wrong with me? What about me?
To which Jacob simply replies,
What about you?
That seems like a strange response to me. Is he trying to provoke Ben? Has he accepted that Ben is going to kill him? Later on, when Miles is holding Jacob's ashes, he reveals that Jacob was hoping until the moment he died that he was wrong about Ben. If he hadn't given up hope, I would have thought he would try to calm Ben down and explain things to him. But he just stands there and delivers this line. One of the comments on the video I linked to states,
to those who don't understand why jacob didn't just tell ben he was being manipulated, it was because he believed everyone was good and would make the right choices without knowing all the facts and any form of influence.
I'm not entirely satisfied by this answer, however. If Jacob was hoping until he died that he was wrong about Ben, this means he understood that Ben was capable of murdering him and wasn't deluded into believing that Ben would make the right choices. Does anyone have a different or clearer explanation of Jacob's line?