What seems to be evil in the world of Appearance is, for all practical purposes, genuinely evil, since the world of Appearance is the real world for any purposes that are not purely intellectual.
Knowledge or understanding that comes only from abstract thinking or theory, separate from practical experience or real-world application.
world of Appearance(Russell's term in 'Seems, Madam? Nay, It Is' for the experiential world, contrasted with the Absolute Idealist's timeless Reality.)
The world of daily life as experienced temporally, which proceeds independently of the alleged timeless Reality and constitutes the real world for all non-purely-intellectual purposes.
At first Russell was an adherent of McTaggart. This afforded him a neat solution to Sidgwick’s problem. The happy day when the harmony becomes explicit can be promoted or retarded by human action. If I benefit myself at your expense not only am I doing down a self with whom I am, in Reality, intimately linked—I am putting off the day when the harmony that Really Is becomes apparent. And since this harmony will be supremely pleasurable I am harming myself into the bargain. Hence morality and self