Sequential decision-making impacts moral judgment: how iterative dilemmas can expand our perspective on sacrificial harm.

When are sacrificial harms morally appropriate? Traditionally, research within moral psychology has investigated this issue by asking participants to render moral judgments on batteries of single-shot, sacrificial dilemmas. Each of these dilemmas has its own set of targets and describes a situation independent from those described in the other dilemmas. Every decision that participants are asked to make thus takes place within its own, separate moral universe. As a result, people’s moral judgments can only be influenced by what happens within that specific dilemma situation. This research methodology ignores that moral judgments are interdependent and that people might try to balance multiple moral concerns across multiple decisions. In the present series of studies we present participants with iterative versions of sacrificial dilemmas that involve the same set of targets across multiple iterations. Using this novel approach, and across five preregistered studies (total n = 1890), we provide clear evidence that a) responding to dilemmas in a sequential, iterative manner impacts the type of moral judgments that participants favor and b) that participants’ moral judgments are not only motivated by the desire to refrain from harming others (usually labelled as deontological judgment), or a desire to minimize harms (utilitarian judgment), but also by a desire to spread out harm across all possible targets.