I have studied enough Anthropology to understand the inherent problem here. I will try to state it simply. I am addressing only one problem but there likely are thousands if you really think about it logically.
Okay. Why do genetics exist?
Or better said, "Why do the specific genetics of human beings exist and not others?"
They are not self selected really. They exist because other genetics could not survive for one reason or another throughout human evolution.
Let me give you an example. I'm half Scottish and one of the traits of Scotsman is the ability to survive the cold when it snows without shelter. So, one of the traits passed down to me is very fine but thickly growing hair that doesn't fall out like some other types of hair does so even at 68 I'm not bald. This was a good trait as long as I or my ancestors lived in a cold place like Scotland.
However, when my Grandfather and Grandmother left Scotland around 1900 they moved to warmer climates where in summer it might get very warm. First they moved to Nebraska which can get warm in summer and then they moved to Seattle where it doesn't usually get hot in summer until the last few years from Global Warming where Seattle and Portland can get over 100 degrees Fahrenheit in the summers which is unusual for any time during the 20th century, for example.
However, my father and mother moved to San Diego and the Glendale in Los Angeles when I was 4 and 6 years old. My first case of heat stroke was at age 10 in Glendale at around 115 degrees. I realize now it was because of two things.
1. my genetics were set up for living in a cold climate year around and not for places 115 degrees ever.
2. my hair because it is so warm was likely going to give me heatstroke in the sun eventually in these kinds of temperatures, especially if I was working hard or hiking hard in this kind of temperature.
So, as a result I had heatstroke at 10 then heat stroke at 27 which cost me a job because I couldn't adapt to that much heat and working that hard outside which caused me to have to move to a different location with my wife and baby.
Another problem was people had long hair a lot in the 1970s and so did I which meant I was going to get even hotter.
Okay. That's just me in my life.
Now think about all the genetic traits that were specific to where people's genetics originated worldwide.
And how many people are not suited at all genetically to where they presently are living or working here on earth. And this is getting more and more extreme because of the ease of Air Travel all over the world now.
Add to this Global Climate change where places are either getting hotter or more droughty or more flooding or more storms which is making more and more people out of sync with their environments as they move around the world traveling or scrambling for jobs in new areas to survive.
Now you add genetic manipulation through software that people think up on a fluke (for any good or bad or unknown reason).
People are really tempting fate here messing with genetics. As you can already see just traveling to a different climate can have really unexpected consequences. When you add to this genetic manipulation you could get people so completely out of sync with their environments that they become completely dysfunctional throughout their lives.
There are already enough people like this.
Our genetics got us here and everyone not suited to where they lived or their culture or all sorts of stuff just died in the past.
Every survival situation is different.
So, even though a genetic change might make sense in the now it might cause human extinction in the future because every genetic trait has good and bad consequences to it. So, it is difficult for humans living in the now to have any idea of the long term consequences to their genetic changes to get rid of undesirable traits.
Because every (undesirable) trait also has a useful side to it if you look hard enough or it wouldn't exist in the first place. It might not lead to longevity but it has some use that you might not be able to see presently.
So, it is important to see every genetic trait having a useful point too. None would exist if they didn't help the evolution of the human race in some way. You just might not see it right now.
Because even seemingly undesirable traits had some good aspect in regard to human survival during the last 15,000 years on earth or else those traits would not exist now.
For example, The God Gene which makes about 80% of people believe in God. The reason I believe 80% of the people have it and 20% don't is because when the 80% are sucked into some bad religion the people without it save the rest of us and possibly execute the bad religious leader so we can go evolving as a human race here on earth and not all go extinct into some bad religion. So, to me, the people that don't have the God gene are useful to to the ongoing survival of the human race.
Each trait has a use to the entire race. It might be inconvenient to individuals within the race to have this gene. But, every single human trait we have is what got us all here in the first place. Understanding this we keep evolving as a human race. Not understanding this we manipulate our genetics too much and all go extinct because we eliminated something we needed 100, 500, or 1000 years from now.
Look at your dogs right now here on earth, for example. Who is healthier, the pure breeds or the mongrels?
The mongrels are the healthiest and don't have all the problems of hybrid breeds. You might like the hybrid breed better but they cannot survive in the wilds can they?
What happens if human civilization collapses for some reason. Who do you think is going to survive that?
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