You misunderstood. It says some of them celebrate that their child will have the opportunity to be a part of their community and culture. From what they've experienced, they can see it'd be a profound shame if their child isn't able to participate in something they've had so much positive experience from. Though that's not universally true. Also a child growing up hearing with deaf parents will have a whole set of problems that they would find challenging to meet, and could fear not being able to help.
On top of that, cochlear implants are not miracle devices, and as I understand it, deaf children who get it will still have significant hearing and speech issues and may end up isolated from both sides.
I get that people need to accept things like deafness or blindness, and adopting a community and sharing the support that provides is a big part of that. But denying your child treatment that would allow them to have all their senses, because you want them to be a part of your community and culture, is a selfish act, full stop. If parents are expected to try to give their child the best life possible, a treatment to restore a deaf infant's hearing is a no-brainer. It's table stakes. I agree that denying a child that is abuse.
If they're hearing they won't understand the deaf community, nor need it, and will miss out on what their parents and other community members valued so much
Deafness is a medical issue depriving a human being of a naturally evolved sense that is critical to survival even in a stable civilized world. Denying them that sense because of identity politics is every type of wrong.
2. What you mean to say is denying people the ability to regain their sense of hearing, and the medical interventions you're alluding to don't do that to the extent you're imagining. Our best approaches, cochlear implants: don't restore hearing in the way that removing earplugs would, have a large learning curve; only work on some people; and the affected person's brain usually can't be fully capable of understanding and reproducing spoken language the way a born-hearing person would. People who receive them also still rely on some amount of lip-reading, sign, and apps.
3. People who are adept with sign and familiar with the deaf community often communicate far, far easier with sign language than a hearing person communicating with a deaf/HoH person who has a cochlear implant
To what extent do you actually have knowledge and experience on the topics you're discussing?
Do you have something resembling a point?
You can live without a sense of smell too. But I for one find it extremely useful when a quick sniff tells me some food stuff which otherwise looks fine has actually gone off.
My son is deaf, with a CI in one ear and hearing aid in the other. If you couldn't see them, you wouldn't think there was anything different about him.
In some ways, it's a moot point, since iiuc, most deaf children are born to hearing adults, and not within the Deaf community. Genetic treatments will almost certainly be preferred by those parents, and the Deaf community will slowly age up and die out in a few generations for lack of replenishment.