Chrissiejane, I like your comment about Turin's child-like inability to learn from his painful mistakes. This is reflected in the original Norse/Germanic tales of Sigurd the dragon-slayer, who was orphaned and then raised by the grudging and reluctant dwarf Mime. Once Mime realizes how incredibly strong Sigurd is, he plots to use the man-child in order to gain the Rhinegold guarded by the fearsome dragon Fafnir. He figures that Sigurd will either be killed in the attempt, or that he can trick the rather simple and hapless lad into giving him the gold and the Tarnhelm, and then Mime would kill Sigurd himself.It interests me that, his remorse and pity notwithstanding, he seems unable to apply his experiences and learning within different contexts: that's a child-like characteristic, and I wonder how much Turin's lack of hands-on guidance from his parents, in his early years, is responsible for him sustaining this quality into his adult years.
Sigurd is portrayed in this myth as reckless, thoughtless, easily led, and unable to learn from his mistakes. Sounds familiar, doesn't it?