Love is the only cure. "A terrible virus has spread across the planet and turned the human race into bloodthirsty monsters. Mankind's only hope for survival is . . ." Originally part of the tagline for the sci-fi thriller "I Am Legend", these lines describe the undercurrent of unrest and turbulence in our world. The virus we face is hate-an epidemic infecting social media, politics, neighborhoods, and homes. Communities of believers,...