He was bullied for his outspoken opinions and didn't care much for Republicans. Karl Pierson, 18, who stormed his Colorado high school brandishing a shotgun and bearing hatred for his debate coach, critically injured a 15-year-old fellow student before shooting himself to death Friday afternoon as he was cornered by heavily armed police. "He had very strong beliefs about gun laws and stuff," said junior Abbey Skoda, who shared a class with Pierson during her freshmen year, The Denver Post reported. "I also heard he was bullied a lot." After undergoing surgery Friday, the injured girl was listed in critical,...