Pestilence did a lot of horrible things in the first three books. While your mind may tell you Reseph had no control over Pestilence and should not be punished for it, emotionally it's difficult for his family and friends to handle. Even Reseph cannot help but blame himself for every evil action Pestilence took. Reseph's struggle was heart touching and Ione did a wonderful job bringing the situation to a satisfactory conclusion.
I'm definitely looking forward to Reaver's book.