Part of my motivation of writing my original comment was because I realized that the author of the article made a mistake. I'm not blaming the author because I've made the same mistake and I've seen it made often. I never really thought about it much. The mistake is trying to explain depression in terms the non-depressed family could understand. He even used that common metaphor of being in a dark tunnel. Everyone can relate to being in a dark tunnel, right? That's the problem. Then they think of terms that they can relate to and are more tempted to blame the depressed person for not just "getting up" like they've done when they were in a dark tunnel.
It occurred to me without really being conscious of it that the correct way to describe depression is in terms they do not understand. That way they'd see depression correctly, as something really abnormal and serious. I wanted to show that the depressed person was incapable of thinking in any way helpful for others or themselves. I wanted them to see it like you might see a man sitting on the tracks when a train is approaching and not only refusing to move, but seeming disinterested in it and almost content to die. It's shocking but it's true. It's so far out of the normal band, unlike the dark tunnel. Family are not powerless and should get into action. Push that man off the track!