It's up to parents to provide an example for their kids, and instill the values that are necessary for success (hard work, determination, commitment, etc).

Edit: I should put up something other than a snarky picture, I guess, since I generally agree. But the question is then, what you do about it. Saying "tough tuchus" to the kids who happen to be born to the wrong parents isn't enough, certainly not for the kids, and also not for society that has bear the burden as well. As monkeyboy mentioned, the question then comes to be what you do via policy and law to attempt to establish or recreate this environment for the unfortunate many. It's not easy to work this out, and it always fall somewhere short, but Lord knows it's worth the effort and that personal responsibility canards don't get you anywhere.