  Empirical psychology has recently cast doubt on the reliability of at least some of our moral intuitions. Since a self-evident proposition is one of which a clear intuition justifies us in believing it, these doubts call into question the claim that our moral intuitions justify us in believing them, and thus whether there are any self-evident moral propositions. The experiments that cast doubt on our intuitions tend to focus on our intuitions about trolley cases. Consider the following three cases: