Could depression, or other mental illnesses, be the outcome of one's bad decisions (or failure to make decisions)?
Sometimes, the outcome of one's decisions (bad is an unnecessary value statement here. Was it a "bad" idea to start a restaurant that failed and made you sad? Cmon).
However, a huge swath of mental illness, including depression, is the result of environmental and genetic factors utterly outside your control. Your mom smoked crack when you were in her womb and somehow that's "the outcome of your bad decision?"
You just moved the shaming from "look they are lazy and don't move from the couch" to "they are lazy because they made bad decisions"
You can fail to take action, you can take drugs to manage the negative situation more comfortably, but, if abuse is the underlying issue, a genuine change of circumstances is required.
However it can take a while to realize the problems and manage to get out. This may have effects that last for a good while. People do not deserve abuse or the negative effects of such abuse, just because they technically could have made a change, or made it earlier.