The funny thing is, it's a fallacy to think that only the fittest humans have survived. Generally the tendency will be towards fitter humans surviving than unfit.

BUT most of the depredations of fate have been totally random! Fit have died alongside unfit in droves. The humans that are still alive are generally the _luckiest_ ones who have avoided somehow the population stresses that have more-than-decimated their race.

So the overall fitness of the azerothian human species has only improved maybe 1% or 2% despite their population decrease of more than 90%, which contributes to poor genetic diversity, which, in supreme irony, will lead to a long term fitness _decrease_.

Randomly killing nine tenths of anything does not make it a better species. This is why evolution is generally thought of as a "slow" process.

Also, evolution doesn't go for "better" people, it goes for local optima, which just might as well lead to a tendency for humans to prefer living alone in the swamp where wars are unlikely to touch them.

I mean, how have the survivors survived so far? Er, by NOT living in big, important, centrally located cities that Archimonde felt like reducing to dust. So in this case, city dwellers were the "unfit" and subsequently, quite dead.

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