I want to point out that "luck" kicks in for both, the "best suited" and the "worst suited". So i expect that the "lucky factor" evens out in evolution. Similarly the bell curve (if it is present) also evens out between "best suited" and the "worst suited". The walmart experience may be caused by different assumptions: as first i would suggest that "best suited" in view of evolution is not the same as you (or anyone else) would expect as "best suited". In my opinion evolution is driven by selection, especcially by fhe selection which individual is not to pass it's genes. Having this in mind maybe evolution is at least partly switches off in the human civilization (which is ok for me as with my glasses i would presumalby sit on a dead branch)...