Here is an example of how i prove my statements, this is something you don't do...
I can give you more sources, but your terrible at keeping up an argument, Now your trying to change your original statement (oh who cares about the semantics of english language)...
Again: Mentally retarded people are disabled, just like someone who hasn't walked since birth. Both can contract say a cold, and they become Ill. Both can also contract a mental illness at some point in their life (not from birth, thats where your mixing things up).
A mentally retarded person can have a rewarding emotional life with good relationships. A person with a mental illness can have trouble there when they are experiancing symptoms. A mentally retarded person can live his whole life happy and content, or he could feel depressed at times, or even suffer from severe mentall illnesses like schizophrenia and bipolar disorder.
I told you to be careful.