Oh yes, I'm familiar with this. I work in cancer care. Not on the front line, but in a call centre, so I'm talking to the families of people like Jim every day. I could tell hundreds of stories.
The thing is though, most of them would be happy and uplifting. Sure, a few would break your heart, and even after four years in the job I usually get one that hits me in the gut every week, if not more often. Mostly though, people are happy. They make the best of things and find joy in the simple pleasures of family, everyday activities, and the masses of care and support that they get from the people around them. I don't find working there depressing at all. Everyone is so positive, and it isn't just "Good grief, by comparison to Jim I'm doing ok", it is positive human interaction with people who care, and people who are grateful to receive that care. There's an incredible amount of humour too. In the OP, Jim makes a joke about the size of the mound of shells he has fired. I think that is great.