There are people out there who choose to differ. A google on 'deaf dalmatian' tells me there are rescue orgs all over the world rescueing deaf dalmatians from unregistered breeders and finding them homes. And there seem to be plenty of success stories about these placements.
Don't get me wrong, I am not saying at all that you or just anyone should adopt a deaf dally! I am sure that it would require a pretty special person to train them. (I'm also not saying you are not special, but you know what I mean?! ) But they are out there and doing a great job.