[dwaltrip]

I'm simply spouting my random opinion here, but my guess is that the communities you point to suffer from non-ideal cultural-behavioral traditions that are passed down and ingrained into each new generation. If one is raised in a family/community where money is always an issue/stress point, parents are overworked, alcohol and shallow-content media are the main forms of entertainment, little encouragement for hobbies is provided, etc, then the odds are stacked against pursuing what many people might consider an intellectually-engaging or constructive lifestyle.