An Oprah-inspired program in public schools described by critics as an intrusive, emotionally manipulative effort with the laudable goal of ending bullying, cliques, gossip and other such behaviors, has been presented to a million students in 400 cities in 47 states. Challenge Day, the subject of the 2010 MTV series, “If You Really Knew Me,” promises to provide schools and communities with “experiential programs that demonstrate the possibility of love and connection through the celebration of diversity, truth, and full expression.” But critics contend Challenge Day, an independent, nonprofit program, can do more harm than good and pose a danger...