Pies-in-face attack roils anarchist-vegan world Demian Bulwa, Chronicle Staff Writer (03-16) 18:30 PDT SAN FRANCISCO -- An ex-vegan who was hit with chili pepper-laced pies at an anarchist event in San Francisco said Tuesday that her assailants were cowards who should direct their herbivorous rage at the powerful - not at a fellow radical for writing a book denouncing animal-free diets. Lierre Keith, a 45-year-old Arcata resident, was attacked at 2:15 p.m. Saturday at the 15th annual Bay Area Anarchist Book Fair while discussing her 2009 book, "The Vegetarian Myth." A 20-year vegan, Keith now argues that the diet is...