The French satirical magazine, Charlie Hebdo, was presented with a Freedom on Expression award from the PEN American Center this week. Six high-profile writers boycotted the awards ceremony at PEN's big annual gala. Hundreds more protested, while others gave the magazine's editors a standing ovation. The chairman of the PEN World Voices Festival is Colm Toibin, the celebrated Irish novelist. Toibin shares his thoughs on the controversy.