I doubt that people became more utilitarian as they became more drunk. A simpler explanation is the participants answered the questions using the same altered thinking drunk people use to choose their own behavior; They think far less than normal about the social consequences of their actions. You don't want to flip the trolley switch in part because you feel more likely to be blamed for the outcome, or to be held ac…
You can slightly change the context of the problem, and it entirely changes the character of responses: Imagine you're an accountant working for the government. You choose how medical research funds are spent. One day, you notice that there are two equally expensive programs: Program A, which will save one life next year, and Program B, which could save five lives next year. Program A is being funded, but Program B i…
Distilling real-life into utilitarianism scenarios is fraught with reductionism - there are many factors that drive people's decisions and those all add up.