Bingowings said:

It would have made sense if there was a universal sign language.

That way deaf people would have an advantage over all other people as they could communicate with people of other nations without having to learn a

Noo! Then deaf people would become emboldened and attempt to build a tower to heaven or something equally crass and God would have to confound their sign language to keep them from working together against him. And all that work of building a universal sign language would be for nothing.