 The primary reason for restricting the entry to radical cognitive disability, like the reason for restricting it to cognitive disability, is dialectical. Few contemporary philosophers would deny that human beings with mild or moderate cognitive disabilities have the attributes required for what we call “full moral status.” Philosophers who see self-consciousness and practical rationality as necessary for that status generally recognize that mildly and moderately disabled humans possess those attributes, and possess them to the extent necessary to reach the threshold set by their accounts of full moral status (see  Sec. 2.1).