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Originally Posted by Bender
whereby 'favourable' traits are a defining factor when choosing a mate to breed with you mean? and the eventual canceling out of unwanted traits and genes through generations of reproduction. yes, I get that. but nature also has a balance that it will keep. the weakest will die, the strongest will survive. less about 'selection', more about balance. selection is obviously part of that process, but only a part. not the whole.
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Yes, you got that bit right. What you don't seem to grasp is the timescale. Evolution doesn't have any noticeable effects over a couple of generations (not in humans anyway). Genetically, there really is very little that sets you and me apart from people in the developing world. If anything, they are hardier for having survived the odds which given the difference in wealth and hygiene are firmly in our favour, not theirs.
In the short term, there is no relation between people dying and their level of fitness or stupidity. People don't die because they are weak. They die because they are poor and don't have access to proper sanitation.
Have a look at the top ten killer diseases in the developing world.
http://www.alertnet.org/topkillerdiseases.htm
Number four is bloody diarrhoea, responsible for around 7 to 8 percent of all deaths in the developing world. Yes, you'd have to be really stupid to die from that, particularly if you're five years old, and there's no clean drinking water around.
The truth of the matter is that you are alive and healthy (presumably) not because of your superior genes that result from the favourable evolution of the Western world, but because you were born on a continent that is rich. Leaving the developing world to their own devices because that's just natural selection at work is not only misguided and immoral, it's also stupid because it's not in our interest.
Aid, or more particularly, increasing wealth in the developing world is going to benefit us for two main reasons. It will drive down the population as people will feel less compelled to have many children as they do right now because they will be dependent on them in old age. It will reduce migration, as there will be less to flee from.