A prominent finding in causal cognition research is people's tendency to attribute increased causality to atypical actions. If two agents jointly cause an outcome ("conjunctive causation"), but differ in how frequently they have performed the causal action before, people judge the atypically acting agent to have caused the outcome to a greater extent than the normally acting agent. In this paper, we argue that it is the epistemic state of an abnormally acting agent, rather than the abnormality of their action, that is driving people's causal judgments. Given the predictability of the normally acting agent's behaviour, the abnormal agent is in a better position to foresee the consequences of their action. We put this hypothesis to test in four experiments. In Experiment 1, we show that people judge the atypical agent as more causal than the normally acting agent, but also perceive an epistemic advantage of the abnormal agent. In Experiment 2, we find that people do not judge a causal difference if there is no epistemic asymmetry between the agents. In Experiment 3, we replicate these findings for a scenario in which the abnormal agent's epistemic advantage generalises to a novel context. In Experiment 4, we extend these findings to mental states more broadly construed. We develop a Bayesian network model that predicts the degree of mental states based on action normality and epistemic states, and find that people infer mental states like desire and intention to a greater extent from abnormal behaviour. We discuss these results in light of current theories and research on people's preference for atypical causes.