The nature vs. nurture issue is definitely an old one that has no clean answer, both scientifically and philosophically. Personally, my policy is save judgement until they fuck up, but every kid deserves a fighting chance, which they aren't gonna get in bumfuck Afghanistan.
I think of people like dogs. While there are definite behavior predispositions in different breeds, any of them can be raised right or wrong. Pitbull, lab, dachshund, whatever - BUT a poorly raised pitbull is a helluva lot worse than a poorly raised dachshund.