My guess is that those mental models don't provide much comfort to people suffering from depression. Our brains evolved over many years and they require certains things to be present to be able to work at a normal mood elevation. Research suggests that the ability to find meaning or living according to "core values" is a necessity for most of us to escape depression. Whether or not it's logical or rational is irrelevant, it's how our brains work and it's just as important as sunlight, physical movement, and normal Vitamin D levels.