Around 8.4% of adults suffer from clinical depression. Not only is it treatable, but one of the most important things about recovery is allowing the individual to work.
Forcing a person to resign due to this kind of mental illness, is a death sentence. One might say your cure is worse than the disease.
Now if Fetterman chooses to resign, that’s entirely different. Most people would rather choose to work than forced to resign. That said, I’m sure there is a lovely severance package even for a modest congressman who leaves due to mental illness.