Two weeks to the day that a heavily armed radicalized Muslim couple killed 14 people at a work holiday party in San Bernardino, California, President Barack Obama tried to reassure Americans nervous about terrorism. Flanked by top officials at the National Counterterrorism Center, Obama said there are no “specific and credible” threats to the homeland. New polls indicate more Americans are concerned about a terrorist attack than gun violence, although one survey shows seven in 10 believe mass shootings have become a normal part of American life. The right to bear arms is among the most hotly debated constitutional issues. Demands for stricter gun control laws grow louder with each inexplicable act of violence: Sandy Hook, Columbine and, now, San Bernardino. The gun lobby and its supporters are no less pained by these tragedies, but say no law can stop a determined individual from buying a weapon. It is a familiar debate – one that continued on the week that first of the victims of San Bernardino were laid to rest.