Freedom of speech is a bedrock principle throughout the Western world, but increasingly it is being challenged — on college campuses, among intellectuals and in politics — in the name of preventing offense and "hate." Why is this happening and what does it mean for the future of free speech.Panelists are Steve Simpson, director of Legal Studies at the Ayn Rand Institute and editor of "Defending Free Speech"; Flemming Rose, author of "Tyranny of Silence: How One Cartoon Ignited a Global Debate on the Future of Free Speech," and Dave Rubin, creator and host of the Rubin Report. The event, "Free Speech Under Attack," took place at Objectivist Summer Conference 2017 in Pittsburgh, Pennsylvania, on Tuesday, June 13, 2017.