> Because they actually care about the patients and the work is critical?

That's not a good reason to be overworked to the point of extreme misery and possibly suicide.

You can care about your patients, do critical work, and still have a workload that is reasonable.

As the author said, there was one job that was much more enjoyable. I'm sure they cared about the patients in that job just as much as they cared about the patients in the miserable job.