Naturalistic explanations of apodictic moral claims: Brentano's ethical intuitionism and Nietzsche's naturalism

In this article (1) I extract from Brentano's works (three) formal arguments against "genealogical explanations" of ethical claims. Such explanation can also be designated as "naturalism" (not his appellation); (2) I counter these arguments, by showing how genealogical explanations of even apodictic moral claims are logically possible (albeit only if certain unlikely, stringent conditions are met); (3) I show how Nietzsche's ethics meets these stringent conditions, but evolutionary ethics does not. My more general thesis is that naturalism and intuitionism in ethics need not be mutually incompatible. © Springer Science+Business Media B.V. 2007.