> twin studies point to some genetic contribution...

Of course there is a genetic contribution! I'd say that there is a genetic contribution to just about any disease. We are all somewhat different. But most of the stories (or headlines) saying things like "key genes cause schizophrenia" imply that they are the only things that really matter. For someone who has symptoms similar to those of schizophrenia, and who is pretty sure there is an environmental contribution to their origins, I often find these stories triggering -- particularly because the treatment one gets under these theories denies the reality of the history that the person knows to have happened. One is told that "what happened to you did not happen to you" or at least, it is of no significance...