Not saying you are wrong but can you point me to the biblical text backing that up?
I remember reading about special consideration for the simple minded but not mental illness. (Again - not saying you are wrong)
Having worked for 20 years in a large hospital located in a major city I've come across *many* schizophrenics in my day.And I can assure you that terms like "simple minded" and "feeble minded" are perfect ways to describe such individuals.They're very well suited to describe many "retarded" people as well.