So, it's a disability because you consider hearing a normal bodily sense, and normal is good while not normal is a disability. Basically, because you say so.
No, because science says so. Having all 10 fingers is normal. Having all your senses functioning is normal. Having all your synapses firing when they're supposed to is normal. Not having these isn't "abnormal" in the sense that that person is some freak of nature, it's simply not a 100% functioning body. Not because I say so, but because that's the body's say so. And for someone to WANT less for their child than the most optimally funtioning body is absolutely cruel. Your train of thought is why can't someone want a child with Down's syndrome? As long as the parent doesn't think it's a disability, it isn't, right? How about wanting a child with Spina Bifida? Muscular Dystrophy? I mean, if the parent doesn't think anything is wrong......then there isn't, right?
Now, before that gets twisted, if a person were to give birth to a deaf child or a child with any kind of disability, that's entirely different, and the child would be loved regardless of their disability, just as much as if they were perfectly healthy. But to want a disability for a child is far beyond selfish & cruel, in my book.
Perhaps they have a different idea about what constitutes "normal".
Perhaps their idea of "normal", has been distorted by their disability. It makes perfect sense, because to a person born with a disability, that's "normal" to them