 The strategy here is limited to the class of nonidentity cases that reason from (a) had the act under scrutiny not been performed, the person who exists and suffers as an effect of that act very probably would never have existed at all and (b) that existence is worth having to the conclusion (c) that act does not make things worse for, or harm, that person. That class of cases includes Kavka’s slave child and pleasure pill cases, Parfit’s depletion and risky policy cases, Broome’s climate change case and cases involving historical injustice. The proposal does not, however, suggest that there is still a further class of nonidentity cases that does challenge the person-based intuition. Rather, it considers that further class of cases – which includes cases in which the existence is worth having but unavoidably flawed due to a genetic or chromosomal disorder – as less worrisome in the sense that it is surely less clear to us that the acts under scrutiny are themselves wrong.