There are several forms of abuse as you know. There is emotional abuse, physical, etc. We never said your parents are abusive. They did the best they thought they were doing. If you were able to communicate and UNDERSTAND your parents, then I don't believe it is a form of neglect. If you understood them orally more than not, then you are a lucky child.
Notice we didn't stress the emphasis on learning exactly sign to communicate with your Deaf child, we said, "Do what ever it takes".
Again, if Hearing parents didn't talk to or try and communicate with their hearing children, never teaching them values, or having any kind of conversation to help them grow, then YES that is NEGLECT AND ABUSE.
Believe me, I don't want to start a flame war or anything like that, so please don't take to offense when others have different opinions. Even if it's a first time you heard a new concept like this.
But you can ask any childcare social service and they will tell you that if hearing parents did this to hearing children, they'd have their child(ren) taken away from them.
What we need is more Deaf educators and people like rockdrummer, who get it. Who don't oppress us just because we can't hear. Parents who aren't embarrassed to have their children learn sign just because it 'looks funny', or because they horrendously and mistakenly think that if their child learns sign or if they learn sign for their child that it will prevent them from getting on in the hearing world. THAT IS SAD.