It has been experimentally shown that certain primings and situations increase utilitarian reasoning; for instance, people are more willing to give the "utilitarian" answer to the trolley problem when dealing with strangers, rather than friends. Utilitarians like to claim that this is because people are able to put their biases aside and think more clearly in those situations. But my explanation has always been that it's because these setups are designed to maximise the psychological distance between the subject and the harm they're going to inflict - the more people are confronted with the potential consequences of their actions, the less likely they are to make the utilitarian mistake. And now, a new paper suggests that I was right all along! Abstract:

The hypothetical moral dilemma known as the trolley problem has become a methodological cornerstone in the psychological study of moral reasoning and yet, there remains considerable debate as to the meaning of utilitarian responding in these scenarios. It is unclear whether utilitarian responding results primarily from increased deliberative reasoning capacity or from decreased aversion to harming others. In order to clarify this question, we conducted two field studies to examine the effects of alcohol intoxication on utilitarian responding. Alcohol holds promise in clarifying the above debate because it impairs both social cognition (i.e., empathy) and higher-order executive functioning. Hence, the direction of the association between alcohol and utilitarian vs. non-utilitarian responding should inform the relative importance of both deliberative and social processing systems in influencing utilitarian preference. In two field studies with a combined sample of 103 men and women recruited at two bars in Grenoble, France, participants were presented with a moral dilemma assessing their willingness to sacrifice one life to save five others. Participants’ blood alcohol concentrations were found to positively correlate with utilitarian preferences (r = .31, p < .001) suggesting a stronger role for impaired social cognition than intact deliberative reasoning in predicting utilitarian responses in the trolley dilemma. Implications for Greene’s dual-process model of moral reasoning are discussed.

However, given my low opinion of such experiments, perhaps I should be very careful about uncritically accepting evidence that supports my priors.