No agenda with this write-up, is there?
I may be the only one, but I don't equate mental illness with mentally retarded. There's a difference between being incapable of distinguishing right from wrong and having some emotional problems.
Paranoid schizophrenia is a lot worse than merely an "emotional problem." But paranoid schizophrenics may well be able to tell the difference between right and wrong.
I've also seen cases where people where "diagnosed" paranoid schizophrenic because the idiot shrink just can't believe a sane person could be so mean.