rationalskepticism.org

I guess he's saying that epistemic norms are parasitic on moral norms and that insofar as atheistic views cannot ground the former they also cannot ground the latter. Atheists therefore, unable as they are to ground the categorical 'should', should take some sort of fatalistic or demoralised stance toward their life/intellectual/moral projects. Or something.

He tries to avoid putting the point positively by phrasing the demoralisation in terms of 'But why...?"