Exactly this, you know the child will likely inherit and suffer but the parents want a kid so all that suffering the kid will be forced to endure and be trapped in a living hell… well that’s just fine!
To a lesser extent I see having kids in a world like this as similarly selfish.
And you tell your child when they’re suffering from a life long birth defect/disability that you knew there was decent a chance they would end up trapped like that.
I’m sure that will help them feel better and the rest of their life coping will be so much easier!