Nonetheless, we can improve chances.
Eugenics may improve things in the short run but it could cause more problems than improvements in the long run. By allowing the select few people to breed you have a small gene pool. If you've looked at the world of purebred dogs you will see what can happen when a living being comes out of a small gene pool. That can produce anything from Cavalier King Charles Spaniels who have brains that are too large for their skulls to Boxers and Bernese Mtn. Dogs bein genetically predisposed to cancer. Small dogs often having slipped knee caps and large dogs often having hip dysplasia. That can happen to any species including humans if the gene pool is small enough.