“…The main normative significance of personhood in this sense is that we ought not to kill whoever possesses it against their own will. 55 If the criterion is seen to be necessary, that is, if we believe that the prohibition against ending a being's life requires psychological personhood, we may think that the account leaves valuable 'nonpersons'-human embryos, 56,57 infants, 58,59,60,61 people with severe intellectual disabilities, 62,63,64,65 nonhuman animals with higher emotions, 66 and the likewithout due protection. If the criterion is only seen to be sufficient, 67 however, we can identify another kind of harm, apart from violations against sentience and species-typicality, namely, the frustration of expectations by externally-and involuntarily-induced death.…”