Why Tender is the Night is not a tragedy

Yesterday I noted that F. Scott Fitzgerald's "Tender is the Night" takes a positive turn about 2/3 of the way through as Dick Diver establishes a psychiatric clinic and settles there with Nicole and kids: we actually see him at work helping people, he spends some time with the children, as Nicole's mental health deteriorates he seems to care about her and tries to help her - he's becoming for a moment not only a more sympathetic character but also a more complete and credible character. Spoke too soon. No sooner does Nicole have her latest hysterical breakdown, Dick learns that his father back in Buffalo has died - fathers in Fitzgerald another intriguing topic, they're either vague sources of a few pearls of wisdom, as with Diver and Carroway in Gatsby, or Gatsby's dad himself, the man the son had to flee from and reinvent himself - in any case, though Dick's father has been no more than a cipher through this novel, Dick dos go back and then, hey, why not take six months roaming through Europe, leaving the crazy Nicole alone with the kids - what's the rush? During his wanderings, Dick gets into various fights and drunken messes, learns the sad fate of several of his supposedly glamorous and talented friends, then crosses paths again with starlet, now young star, Rosemary, he visits her on the set of her movie (some of the more interesting passages in Fitzgerald, he was really quite knowledgeable and observant about film), and at last they have sex. So now Diver is not only a drunk and a cad but also unfaithful to his wife and family. Is this story really meant to be a tragedy? In a tragedy, we feel pity for the sufferings of the hero. Yes, Dick Diver is handsome, intelligent, cool. But he has brought his sufferings upon himself, and we feel (or should feel) nothing but contempt.