We can be responsible for our depressions though. The CBT paradigm is that thoughts cause emotions, and if we change our thoughts (which we can have control ove

We can be responsible for our depressions though. The CBT paradigm is that thoughts cause emotions, and if we change our thoughts (which we can have control over) our mood will shift. So there is some self-determination, I don't think the typical comparison with cancer is a good one. (Obviously you can give yourself cancer with behaviors like smoking, but once you have cancer you have little internal control to make it go away. Not so with depression.)