Should we use genetic engineering to improve the human race?

[True Federalist (진정한 연방 주의자)]

No.  We don't know enough yet about the side effects.

Consider the gene responsible for sickle cell anemia as an easily understood example.  The same gene that acts as a recessive trait for sickle cell anemia also acts as a dominant trait for making humans more resistant to the effects of malaria.  That's why the gene is found primarily in people who live in areas where malaria has been endemic for millenia or are descended from such people.  In those area the benefit of malaria resistance outweighed the penalty of sickle cell anemia.  If genetic engineering were used to "improve" the human race, it is all too likely it will be used in a way that reduces the genetic diversity of humans and hence leave us vulnerable to some future disease.