AD lacks any member who would known as an expert in the fields of structural anthropology, ethnolinguistics and/or anthropological linguistics. However, it has been held by these experts that ancient civilizations without any written language, and therefore no reading, were restricted in their culture development due to the ability to mass communicate. This simple means that until written language came about one generation could not share learned ideas with a future generation. Recognized are cave drawings and picture writing, which in themselves lead to a written language. Even today there are civilizations without a written language, and we all know how oppressed these are compared to others in the United Nations. Those who are experts in the fields always say that the more developed a language is, and they do include reading and writing into their equation, the more advance the civilization.
Jillio ask the question: "Who teaches ASL only?" To me that is beside the point here, as you can go back and read that I'm focus on those who communicate in ASL-only. This seems to be a difficult idea for most to understand. However, I'm not "picking on" ASL-only deaf. I'm only acknowledging they exist. Here in Houston with its large deaf population, I would say 15% of the deaf I socialize with are ASL-only. One of the ways I know is because our monthly ASL social, Latino social and other socials are held at sit down restaurants. You can identify the ASL-only deaf by the fact there can not read the menu and need help, which I among others provide.
Within the U.S.A.hearing population would you be willing to agree with me that 15% can not read nor write? I think the percent is close but can offer no proof.
Now moving on to fault. Yes, it can be said for both deaf and hearing that the education system is lacking, however, I live in a "no excuse" world that I set my responsibility on ME. If for some reason I'm lacking in any area, I get busy and do what is necessary.
Which, once again, brings me back to fault. Granted young children, hearing and deaf, were deprived but in the U.S.A. today there are many rectifications (I'll quickly admit more for the hearing than for the deaf) and those who choose to ignore the rectifications are at fault and have only themself to blame.