What you said is not wrong, but on the other hand let's say I'm 100% positive that I have the stuttering genes and decided to have a baby wouldn't that be injustice to that child? I know he will stutter and I know he will suffer from it + nobody can guarantee to live a long life and be near his child in his teenage and preteen phases to give him the adequate support he needs (according to his experience with stuttering) so it's a big gamble that can workout or not. That's my point of view anyway, should it be wrong or right? That's not up to me.