Robert Sapolsky has a fantastic discussion of depression as a form of learned helplessness. We see it in abused animals: https://youtu.be/NOAgplgTxfc?is=YnnSt1292XjiGbEE

You are not much different from any other animal at some level. With enough conditioning you will believe that you have no agency over your own life, and you’ll just sit there and take the shocks hoping it ends soon. Or worse, you’ll lose perspective and imagine the only solution to your current (likely temporary) circumstance is to (definitely very permanently) end your own life.