  Consider another social-scientific debate, this time the controversy over the data showing that stepparents have a far greater propensity to kill very young children in their care than biological parents. What would be involved in providing a rock-bottom explanation for this phenomenon, one that satisfied the precepts of methodological individualism? How informative would this be? It does not take much effort to imagine what people are thinking, when they shake a baby or hit a toddler. The motives are all-too familiar – almost everyone experiences episodes of intense frustration or anger when dealing with children. But that clearly does not explain the phenomenon. The question is why one group systematically fails to exercise control over these violent impulses, relative to some other group. Since very few people do it as part of a well-conceived plan, it is not clear that there is going to be an explanation available at the level of intentional states, or even that a complementary account of what is going on at this level will be in the least bit informative. The problem is that the behavior is generated by biases that function almost entirely at a subintentional level (Sperber, 1997). This suggests that an explanation in terms of intentional states is not really “rock bottom,” but that there are deeper layers to be explored.