For a depressed person, their brain is constantly torturing them, and the depressed point of view seems much more real. "You can choose to pretend you're happy like the rest, but you know how life really goes."
I think you missed the point, the way to "not suffer" is death.
In general every morning we make a decision on whether the expected future happiness is going to outweigh the expected future suffering. When that fails (and it does) we find reasons of duty to keep going, for the people we love etc. You're right, depressed people have a skewed vision of the future and it destroys their expectations of happiness.
I don't think that's obvious - spdustin could be speaking from a buddhist point of view: suffering is caused by desire, not pain. You can choose to remove desire and suffering from the mind through meditation.
For a depressed person, their brain is constantly torturing them, and the depressed point of view seems much more real. "You can choose to pretend you're happy like the rest, but you know how life really goes."