In the end I think it is up to the parent to decide how their children turn out, even if I disagree with that decision. When someone chooses their mate they are doing the same thing, if only in a more crude way, and certainly we've all disagreed with someones mate choice in the past. This is really no different.

If I want to have a child, and the only way I'd be willing to have one is if it completely designed, I would want my child to be tall and intelligent. Some of the variants may be seen as detrimental to some people (HEXA), but I wouldn't want society deciding on that.