"Disability rights advocates also correctly note that quality-of-life assessments differ quite markedly between those who have impairments and those who do not. Many of those without impairments tend to think that lives with impairments are not worth starting (and may even not be worth continuing) whereas many of those with impairments tend to think that lives with these impairments are worth starting (and certainly are worth continuing). There certainly does seem to be something self-serving about the dominant view. It conveniently sets the quality threshold for lives worth starting above that of the impaired but below normal human lives. But is there anything less self-serving about those with impairments setting the threshold just beneath the quality of their lives? Disability rights advocates argue that the threshold in most people’s judgements about what constitutes a minimally decent quality of life is set too high. However, the phenomenon of discrepant judgements is equally compatible with the claim that the ordinary threshold is set too low (in order that at least some of us should pass it). The view that it is set too low is exactly the judgement that we can imagine would be made by an extra-terrestrial with a charmed life, devoid of any suffering or hardship. It would look with pity on our species and see the disappointment, anguish, grief, pain, and suffering that marks every human life, and judge our existence, as we (humans without unusual impairments) judge the existence of bedridden quadriplegics, to be worse than the alternative of non-existence."