Well we already have our lengthy thread about how the word "retarded" is not always offensive, so walking around saying "developmentally disabled people" isnt necessary all the time.
As you might remember from that thread, my cousin who grew up one block from and who's 3 years younger than me is severely, severely retarded with Down Syndrome. He's 27 and he doesnt know his own name, can't read or write, cannot speak in sentences, is only potty-trained about 70% of the time, etc.
Would we (the family) take him to a Broadway show? NEVER EVER EVER.
One person's rights end where another's begin. So, unfortunately, my cousin does not understand that he must be quiet at live theater. If you told him "you have to be quiet once the show starts" he might say something like "Batman!" or something totally random like that. Even if he said "ok", there is no guaranteeing that he has any idea what youre talkin about. And just like in church, if we ask him to be quiet, sometimes he'll respond with a LOUD "f*** you!" (He's got a bit of tourette's too)
So I know some of us on this board have demonstrated political correctness to a terrifying degree---you'd have my screaming, farting, yelling cousin next to you at a show and say "oh well, its his right to be here!!!" No way. Children under 4 cant go to the shows because they can't understand that they got to be quiet. My 27 year old cousin's mental capabilities are the same as a 2 year old. So how can he be expected to be quiet.
When we take him to movies, we always take him to like an 11am show so that there are the fewest amount of people in the theater, because he makes a HUUUUGE scene. When GREASE was re-released in theaters 10 years ago, we took him, and he stood up the whole time and sang nonsensically along with the movie--if we tried to stop him he just hit us and swore at us. After the movie, this mom with little kids walked up to us and said "awww he's so cute!!" We were like uhhh ok.
I feel bad for those people who have such profund developmental disabilities, and yet their families would do something as irresponsible as taking them to a broadway show.