While I would never advocate "customizing" children by hair and eye color, or in some other "cosmetic" way, I must admit that I'd be all for screening out inherited diseases.
Before the thumbs down come rolling in, let me state that, for each of my pregnancies, I chose not to have my children tested for Down's Syndrome --nor did I undergo any of the other routine screenings-- preferring instead to love and accept any child I had.
However, things have changed.
I have rheumatoid arthritis, as does my sister. My grandfather suffered from this also. There's no conclusive evidence that it's an inherited disease, but I certainly have my own reasons for believing it to be.
I don't know that my kids will be afflicted with this disease, but I certainly hope they escape my fate. I realize that I should be thankful I'm not dying, and I am. But the pain and disability, not to mention how it changes you emotionally, is sometimes too much to bear, and I wouldn't wish this on anyone.
I understand now how people can choose to abort a child with an inherited disease. Would I have done the same? I don't know.