I'm going to push back a little on this: I don't know anything about DeMarcus Cousins' specific circumstance, but I know a lot of men from similar backgrounds, who grew up under similar circumstances, and none of them were still overgrown babies at twenty-three. My own best friend grew up under similar circumstances, only instead of rural Alabama, it was rural Maryland.
Is it fair to blame the behavior of a twenty-three year-old on his family? No, but I do think it's fair to call his upbringing into question when a twenty-three year-old who behaves as he does on the court doesn't think that there's anything wrong with it. TTBOMK, no one from his family, or anywhere in his life outside of basketball has ever addressed his behavior; no one has ever said anything to the effect of, "I don't know what's going on with DeMarcus, but that's not how he was raised." It's not completely unreasonable to wonder whether he was brought up to think that how he acts on the court is okay?