InnerBadPlace,

I think your story illustrates perfectly the fact that it is both. No, not all disorders are caused by childhood problems. And I think most, if not all, can be caused by either/or or a combination of both.

Why do some kids who come from really messed up backgrounds end up being normal? It's genetics, the "nature" aspect of things. Why do some who come from great backgrounds end up having a lot of troubles? That's also the "nature" aspect. But there's also a vast majority of people who struggle because of their experiences, or at least their experiences make their struggles much, much worse. And that's the "nurture" aspect.