It's simply a horrible argument to suggest that you have to protect a disadvantaged community by making sure they don't shrink. There's much better ways to be respectful of the great human beings these people are.
I just wanted to point out that there is a path from "would like to prevent" to "stop everybody who does not match the profile from living".
The other responses in this thread already show in which bad light people look at deaf people. Maybe start talking to some of them.
Twisting things around to make people seem bigoted for saying that disability is bad (not that disabled people are bad) is just evil.
It has to be turned around 180 and we have to point out that this push is moral corruption and evil. Even if it comes in part from deaf people it is evil. It doesn't matter what mental acrobatics is developed around this, to wish for other people to become disabled is evil and morally outrageous.
It's the same with the "obesity is actually not unhealthy" crowd, all part of the same ideological matrix.
But then the same enlightened crowd turns around and pushes to legalize euthanasia for depressed people in their 20s...