I was going to explain it.... but I feel it was best explained by Cliff from the tv show Cheers.
'Well you see, Norm, it's like this . . . A herd of buffalo can only move as fast as the slowest buffalo. And when the heard is hunted, it is the slowest and weakest ones at the back that are killed first. This natural selection is good for the herd as a whole, because the general speed and health of the whole group keeps improving by the regular killing of the weakest members.
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