Faulkner's Nobel speech and views

In Faulkner’s Nobel Prize acceptance speech, he allows us to believe there is hope and that man will endure all the evil and troubles in their life. In his writing I don’t see this though. In each novel, there are such depressing circumstances and usually the novel doesn’t end with a very hopeful feeling.  Darl ends up in a nut house, Caddie isn’t reunited with her daughter, Goodwin isn’t freed, Quinten kills himself, Addie enjoyed punishing her students—the list goes on.  Nothing good seems to come from his novels, yet from his speech, maybe Faulkner wanted us to see the evils in humanity.  Even though there are such down right rotten people out there, not all of man is doomed and we will endure throughout time.