Who mentioned anything about saying people with genetic disorders have no right to live???
It's simply saying that if you know you have a high chance of creating children who will have this dissorder, then why shouldn't you choose not to have kids?
It's like saying that people are wrong to use contraception because it denies the life that could have been created.
As said before, if a couple know they carry the gene and it can be repaired then I believe that they should have the option to repair it in any children they produce.
If it can't be repaired, then they should have the choice not to have kids.