In my culture, we believe that when you die your spirit has to climb a mountain, carrying the souls of everyone you wronged in your lifetime. Imagine the weight I will have to lift. The monsters I created, the people they killed. Isaac. He was my friend. Now his soul will be in my arms too. Can you see now why I fear death? You want to hand me over, there's no shame in that. But you won't we all carry our prisons with us. Mine is my past. Yours is your morality.
While Western films aren't my thing, I really enjoyed A Town Called Mercy for the hints it offers about the Doctor's character. If, as I suspect, he has been experiencing season seven backwards, he has already seen the Ponds' fate and is bearing the guilt of however that plays out, as well as the compounded issues from his past. Kahler-Jex just reminds the Doctor of his own attempts at atonement--a quest for forgiveness he can never have. I am looking forward to Angels Take Manhattan, but dread seeing what it does to the Doctor