The trouble with Manichaeism, some wag once wrote, is that it won’t let you eat a Big Mac. At least not without having to bear a load of guilt equal to the weight of the burger. Never mind, of course, that maybe even non-Manichees might not wish to eat one. In a world ruled by Manichees, there will be no meat on the menu. All forms of animal life are off the table, including even a soft-boiled egg.