It may not be very representative, I agree. I struggle with your analogy comparing broken bones to a broken mind. We have known for centuries how to fix a broken bone. We still don't have a 'cure' for depression. "Here, take this pill and feel numb for a few hours" doesn't really compare to an x-ray and a cast.

You're right, there's no obvious cure like for a broken leg. Perhaps cancer would be a better analogy. There are various treatments, sometimes they work, but they mostly suck and it's never certain. But regardless, "just don't have cancer!" isn't going to do it.