User blog comment:ImperiexSeed/Castiel's shifting of Sam's mental problems made no sense!/@comment-79.119.145.115-20120404155428/@comment-3481504-20120404160616

Didn't you watch "Appointment in Samanrra"? In it, Death clearly says, "can't erase Sam's hell", and now your proposing Cas do it.

That's proof that souls can't be destroyed nor can their memories be removed. An angel doing something the Pale Horsemen can't? That's preposterous.