SOME THINK THAT MORAL REALISTS CANNOT RECOGNIZE THE PRACTICAL OR ACTION-GUIDING CHARACTER OF MORALITY AND SO REJECT MORAL REALISM. THIS FORM OF ANTI-REALISM DEPENDS UPON AN INTERNALIST MORAL PSYCHOLOGY. BUT AN EXTERNALIST MORAL PSYCHOLOGY IS MORE PLAUSIBLE AND ALLOWS THE REALIST A SENSIBLE EXPLANATION OF THE ACTION-GUIDING CHARACTER OF MORALITY. CONSIDERATION OF THE PRACTICAL CHARACTER OF MORALITY, THEREFORE, DOES NOT UNDERMINE AND, INDEED, SUPPORTS MORAL REALISM.

In "Moral Realism and the Foundations of Ethics", David Brink defendsexternalist moral realism against Mackie's sceptical arguments, whichpresuppose some kind of internalism. But Brink confuses the issues by failing to distinguish different kinds of internalism. What he calls conceptual internalism may be false, but Mackie can retreat to sociological internalism, which holds that most people believe moral requirements to be capable of motivating action regardless of pre-existing desires. Brink does not challenge that thesis, which isall that Mackie's sceptical arguments necessarily (...) presuppose. (shrink)