Of course, what people say they would do in situations of this sort is usually determined by signaling rather than a realistic appraisal. Kind and philosophical utilitarians of the sort one meets on LW would be extremely unlikely to act in practice according to the implications of their favored theories in real-life "sacrificial" situations, so their views are by themselves not strong evidence of antisocial personality traits.

The study seems to target the category of people who answer like utilitarians do, rather than "real utilitarians" defined in any way, so the study seems to directly challenge this statement. I thought one conclusion was that the advocates of utilitarianism are more likely to be antisocial in certain ways, regardless of how they would act when faced with a trolley problem, which was something not measured here.