Comment by pas

The usual answer is that there are other people who also need things and cannot pay, so then how should the provider pick between them fairly? (And likely some have a "free clinic", and as you mentioned there are options.)

Still almost all of the responsibility is on the patient, which is a terrible situation to be in for mental health patients. And even if the courts will find that the termination was wrongful it's unlikely that matters, because employers are not responsible for keeping employees alive and happy, they are responsible for making the usual safety precautions (see OSHA) and disability accommodations.

All the great perks of our cherished individualism suck when you have no one to enjoy them with.