I have to agree that your take on how Purebloods deal wiht pain et al. makes a lot of sense of canon; without a firm, and generally painful, learning of cause and effect, there can be no learning or growth. I have to love Hermione's recognition of this and her annoyance with the 'Puffs over it. This idiot makes a great contrast to Neville who is learning and growing because he refuses to lose the painful memories.