Wonderfull conclusion. You're wrong! - I never said that. I have seen the writing skills of people that use mainly ASL on Alldeaf and it tells a lot.
I'm saying that for children that grow up with ASl as a first language, learning to write is an extra challenge..., an extra language to learn.
Have a look on AllDeaf.
You say that ASL is a factor for their writing skills? You're wrong, very wrong. Many of us on alldeaf did not learned signs until much later in life, so don't blame it on ASL. You don't even know what you're talking about, Cloggy.
It cause from lack of proper education, most hearing parents, who probably know little or nothing or no prior experience with deaf, most hearing parents intend to listen to professionals instead of finding their own resource on deaf, with thousands of questions run through parents mind as how will my child learn? how can we communicate fully? how will this impact our family, what will my child's life be like? parents were being in denial.
Most professionals would inform parents to have the deaf child reply on speech. Just like how they told my father, My father never knew sign exist until one teacher brought it up. It's important for parents to educate themselves try to figured out the next step to help their deaf child, before it's too late.
It's important to make every effort to meet other parents who has deaf children, nor deaf adults.
If you want to pin a blame on someone, Take your place of blame on those ignorance hearing parents and education.