What's terrifying about this approach is that it denies the quality of life issues at the heart of many depression cases. A person can be depressed because of feeling isolated, extreme guilt or unworthiness, having no purpose in life that suits their nature, or some form of emotional trauma. Chemicals will only distract from the actual healing that can only take place by slow, progressive inner work and finding the courage to change their life circumstances. The solution to depression can very often be found *within* the person, not somewhere "out there" in drug form. Drugs will only mask symptoms while the real disease remains festering beneath the surface, waiting for the moment to spring in a sudden ugly rampage that can easily lead to suicide (the real reason people on medications do this).
I speak from experience because I suffered from extreme depression for 20 years, tried desperately to fix it with chemicals, almost killed myself (more than once), and finally said fuck it, I'm figuring this out on my own. Turns out, no chemicals needed. A shitload of courage, faith in myself and my friends/family, and a daily, long-term unwavering persistence did the job. Knowing that you have the ability to fix your own problems goes a long way towards giving you the power to do so. Enforcing the idea that a person is inherently "broken", that they're depressed because their chemicals are out of whack, makes them feel like a victim and offers no real hope for healing. In fact, it's an insult to the human soul.
Life is way more than just a series of chemical reactions.