"Transhumanist vs Naturalist"
Very more better than ''Eugenic vs Lifeloving'' ! I will keep and hope you will too.
As a biologist-to-be, I'd argue that a eugenic approach based on biology would definitely value diversity.
Heu ...
You should learn about history of livestock and agriculture. Before we have soooooo many diversity. And today, after selection, we have faaaaar less diversity. And with OGM, Mosanto make 5-10 species of corn and sell this everywhere.
If you ask in europe for find the old vegetable, you can find in few areas, the vegetal are very weird (and often not good; maybe it is for that we stop to use them

) and different. We lost soooooooooo much diversity.
So, eugenic = diversity ... the history say you are wrong.
Well, any sane eugenicist (i.e. not the ones that have existed historically) would focus only on a small number of genes that clearly have advantages and which don't relate to immunity, and would seek as much diversity as possible in traits that do not have advantages.
If one day someone can sell one gene and this gene is clearly superior, lot of people will take this gene and we will lost the diversity. Why people should take the gene A with 40% of improve if you can take the gene B with 80% of improve ? For diversity ? Pff ! Other people can have this diversity, I take the best. And everybody take B. We will have only B.
And why we will not change the immunity ? If we find a gene for be strong against 99% of disease and another against 80%, everybody will want the 99% and one day we could have the 1% disease.
The history say you are wrong.
That's because eugenics has a negative connotation, but genetic modification, cloning, gene therapy, genetic engineering, etc are all methods of new eugenics.
Dont talk at the future. We already have an eugenic action in the western society. Around 90% of fetus with trisomie 21 will not born in my country.
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There one point we talk together, but we are not clear :
The transhumanist can try to select DNA for improve the race. But, they will make one race or many ?
If today, we can change DNA, everybody will take all improvement (a little more smart, a little more strong, a little more disease ressistance) and we will have ''one race'' better than the natural one. So everybody can do everything, just we are better everywhere a little (Gattaca).
Or we will make children with a goal ? This one will be focus on disease and a little on smart = good doctor. This one on strong for do a hard work. This one only on smart area for become a reseach. Adapt the skin or the stommach for a specific area on a planet. And we will have a kind of caste society and a greatter variety than today.
And the naturalist will try to keep everybody/race, or will try to focus on one (maybe not better, but ''mine'' and natural) ?