Please note that this post has an informal point of view. I took every emotion out of my reasoning, so all this will sound... deranged, I guess. Keep this in mind as you read on.
Evolution is based on a basic concept: the strongest individuals survive. There is a problem with humans. We are incontestably the most powerful species on Earth, because of, among others, intelligence and technology. We have no predator. We have grown emotions and a conscience (maybe as a drawback of intelligence), and follow what the society as a whole thinks.
The key problems human evolution currently faces are the following:
- Emotions forces us to give a chance to everyone. A couple centuries ago, we didn't have any choice (eg. the plague), but recently, medical breakthroughs allows the feeblest of person to survive. With each passing generation, we are losing evolutionary power, as not only the strongest survive, but everyone.
- People with genetic disabilities / deficiencies, allergies, sociopathic minds, idiots, etc. are "allowed" to breed and continue the human cycle. Everyone have a chance at life, which cancels the natural selection that would usually be in place.
- Monogamy in our culture results in successful men's DNA to be spread by only one person. Take for example Genghis Khan, which reportedly has his DNA in about 8% of the Asian population right now. A person's success can be determined by his wealth and power - polygamy seems a very good way to propagate successful DNA to future generations. A successful man's DNA's spread, in a monogamous culture, is thus greatly reduced.
Another way to look at human evolution is the way we treat babies. Emotions cause the world to stop spinning when something happens to a child. We care for our children to such extremes, that they slowly lose evolutionary power, generation after generation. Kids take at least a year to be able to walk unsupported. Compare that with a baby deer, who starts walking almost immediately. Years and years of evolution has made sure these animals can start walking as fast as possible to evade predators, but we overly protect our children from everything. We protect them from all possible harm, with the consequence that the human evolution is reversing.
For another quick example, we are slowly losing our wisdom teeth, because what we eat on a daily basis is softer than what we ate in the past. We don't need another set of molars, so, evolutionarily speaking, we are gradually loosing them. We don't need warmth because we have winter coats, so we lose our body hair. Similarly, our children may, in a thousand years, only start walking at about three years old. Our excessive caring has exactly the opposite long-term effect.
What other long-term consequences will all of this have? We will be weaker and weaker to viruses, bacteria, and such. We will slowly lose our immunities. We will slowly become more and more allergic to different allergens. Children will take more time to develop physically and mentally. The average "intelligence" will diminish.
As far as I understand it, it seems the nazi tried to recreate a select powerful race - the Aryans - by forcing a genetic tree among the individuals they deemed of "correct descendance". While it seems to have gotten out of hands for different reasons, their concept was a valid one on an evolutionary basis, and because of emotions, most of the planet was against it.
The way I see it, in an informal kind of way, we are doomed.
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