Daphne, is a character who represents the culturally deaf community in her own way, the same goes for Emmett, Melody, and Travis. Do you think Travis represents the culturally deaf community as a guy who loathes hearing people, hates them for what they have "done to him" and that Deaf people are like that? No, of course not. Travis grew up with hearing parents who didn't sign. Ah, a clue. And then look at Emmett and his Deaf parents. And then you have Daphne with a hearing parent who signs, who advocated early in the show against Daphne's biological father that she doesn't need CI and is comfortable being deaf. There are a lot things in the show that educate the public about deafness and the signing culture.
"Restriction on free thought and free speech is the most dangerous of all subversions. It is the one un-American act that could most easily defeat us."
-Thurgood Marshall, former Supreme Court Justice
"... turns out they are telling the truth