[Godel]

Designer humans is a good thing. I hate to break this to you but the current system we have no is actually unnatural selection. The sick don't die we treat them with medicine and they pass on defects. The less intelligent/educated you are, the more likely you are to have kids (in general). No matter how dumb you are or how big a failure, a successful person will be taxed in order to feed you and your children. If this process continues, the human race will get more sickly and less intelligent with time. The only options are, accept this, start killing people, sterilize people, or use harmless genetic engineering to counter the effects. I think the last one is the most logical and humane option.

[unspun]

Yet another utopian ideology to be espoused, which attempt is always concomitant with tyranny.

[Nebullis]

If this process continues, the human race will get more sickly and less intelligent with time.

A very long time. The problem is that everybody is homozygous for some disease. And smart, capable, beautiful phenotypes aren't controlled by single-gene, Mendelian genetics. Maybe in a couple of million years, assuming perfect selection against the smart and beautiful, you might get a change in the overall population.