Pure Nonsense?

James Ley disparages (pdf) the "undergraduate bull session" observations of Terry Eagleton's most recent book, On Evil:

Eagleton’s notion of absolute evil disappears into its own vacuity. Like his definition of God, it purchases metaphysical purity at the cost of irrelevance. As a category it is analytically useless, not simply because it ultimately describes nothing, but because it also explains nothing.