pardon my playing devil's advocate, but it really seems that there is a general idea of the constructiveness of pain. pain can be the most destructive force in the world, be it physical or mental pain. to me, it is not pain that teaches us, but existence as a perceiving being that teaches us.
if i am wishing pain on someone, or wishing them no pain, i am still acknowledging their existence, and so long as we exist, the ability to learn is present.
maybe it is too late at night for me to be posting here
sorry for my ramblings