This first response to “moral catastrophes,” which is to ignore them, might be further justified by denying that moral catastrophes, such as a million deaths, are really a million times more catastrophic than one death. This is the so-called “aggregation” problem, which we alluded to in section 2.2 in discussing the paradox of deontological constraints. John Taurek famously argued that it is a mistake to assume harms to two persons are twice as bad as a comparable harm to one person. For each