CiG
Approximately Infinite Universe
Sure, but many (possibly most) mental illnesses are fueled by some event after birth, and many of those events will be to some degree self-inflicted or otherwise within the realm of possibility for non-medicinal treatment. The only way an automatic deference to medical depression makes sense is if you take the deterministic approach, which can be used to justify anything from suicide to child rape.
WaPo link has a paywall.
Another by the same author that was luckily archived: http://archive.li/GUdBN
Depression actually also has a genetic component, as much as up to 40% of people with depression can trace it to a genetic source. Kids with a parent that has depression are 3 times more likely to have depression and so on.