Nancy Grace on Thursday got into an extremely heated debate with Frank Taaffe, a friend of George Zimmerman, over the series of events that led to the shooting death of 17-year-old Trayvon Martin. Taaffe argued that Zimmerman had a “legal right to carry” his firearm with him and was doing nothing wrong when he noticed a “suspicious” character. “He was a legal concealed weapons permit carrier,” he said. For some reason, Grace was baffled by the mention of a concealed weapons permit. “A legal concealed weapons carrier,” she shot back. “Did you just say that?” Taaffe reiterated that Zimmerman was...