It is about having full access to language for the little ones so they dont end up with severe language delays or deficits. That is what can adversly affect their congnitive process and their ability to think critically. ASL provides FULL access to language for all deaf children. To say this is allowing more deaf children put at these kinds of risks. We cant allow this to happen.
And even with the kids who do have decent spoken language, ASL can really help with social emotional AND can also be a great tool for when a hoh kid is in less then perfect listening conditions. Also, knowing ASL for a dhh kid is like a hearing kid being fluent in say English and French!!!!!!