A lot of depression is definitely caused by having a shitty life where your material needs are not fully met. Some of it is probably a result of funky brain chemistry, but I have serious doubts that represents all or even most cases. The world we live in is just depressing.

But your therapist can't help you unionize your workplace or [parody] your boss. They can't even endorse the leftist political position that tells you that you are not the worthless one, but rather your boss is. All they can do is teach you ways to cope. Unfortunately, those ways to cope often end up aiding the cause of further capitalist indoctrination. The fact that you even need this type of "cognitive restructuring" after your boss makes you feel like shit just signals that the problem is not with the shitty system we live under, but rather the way you are thinking about things.

The proper solution is to band together with your coworkers and try your boss for crimes against the revolution. The therapy solution is to make excuses for your boss and capitalism as a whole. It teaches you to always doubt your instincts when your needs are not being met. Just be grateful for what you have and never rock the boat.