To me "life's not fair" reads as a contradiction to the cited statement. As I understand it GP's argument was that, yes it may have been luck to meet the right

To me "life's not fair" reads as a contradiction to the cited statement. As I understand it GP's argument was that, yes it may have been luck to meet the right people at the right time, but that a lot of conscious decision and discipline went into being in the right position at the right time beforehand. Reading it that way, life is fair, since it rewarded the work previously put into building up a life's success. Another way to say it would be: If facebook hadn't made Zuckerberg a billionaire, something else would have made him at least a huge success (the stellar kinds of successes that people like Zuckerberg experience are probably still insanely unlikely even in the world of billionaires)