re: Please tell me how rich celebrities/athletes/musicians get depressed

While there is no doubt clinical (physical/medical) depression exists, one of the things I think is way overblown is the "tortured artist was fighting demons" garbage. Sometimes people are just frickups. Everytime some actor or musician dies an early death you can bet you'll read "Such and such was battling inner demons and turned to drugs and alcohol..." No, they used drugs and alcohol because they thought it was cool and fun. Poor decisions, irresponsible behavior and laziness aren't "demons". Chris Farley, Jim Morrison or John Belushi ate, drank and abused their way to an early grave. We like to trot out the "tortured, creative genius" trope out when they pass to make those performers seem more profound thus more worthy of our adoration. When, in reality, they're just guys who pretend to be someone else on camera or sing and play guitar on stage who drink or take drugs and get physically addicted.
I have no doubt some celebrities are fighting clinical depression, just like doctors, firefighters and oil rig workers do. But, not every celebrity death is due to some deep, profound inner or spiritual torment that drives them to genius and despair.