True. But as with so many other medical problems, the causes are often either unknown or beyond the reach of our art.
Well some people would disagree with that, and I generally would disagree with that as well.
Many people who seek drugs to alleviate depression, etc. just don't want to confront the reasons why they are that way...
It's the same logic that is behind someone who abuses drugs. They use drugs to mask the pain, and ignore the root causes.