What don't you get? They are able to restrain their behavior and yet do not possess the necessary faculties of comprehension.
I stated... (and I quote)
A simpleton, dullard, child, vegetative human being, etc.. who does not possess the faculties of comprehension necessary to restrain his own behavior consistent with morality, cannot be held to a moral standard. Their actions are effectively amoral.
Clearly, I am speaking about people who DO NOT possess the necessary faculties.
You seem to be trying to rebutt my point, by suggesting that there are borderline functional people who DO possess the necessary faculties.
But if they possess the necessary faculties, then I clearly wasn't talking about them.
What part don't you get?