Depression is the result of an overactive amygdala and has little to do with goal achievement. That can be caused by genetics and/or a wide gamut of environmental and experiential inputs over time. I would think the goal of any intervention is to help people lead more fulfilling lives and prevent self-harm rather than to create a compliant workforce.

Think of all of the people who were born like that. Think of the people who had intensely traumatic experiences at a young age such that their systems grew abnormally. Ascribing a lack of self-discipline to those and many others who face that awful affliction is both arrogant and ignorant.