The truth can be a moving target as our understanding evolves with new data, but we must try to hit the target every time and be honest about our mistakes. This, however, isn't what the gun-control crowd tries to do.
American federalism allows states to be incubators of new ideas and policies. This can be helpful. But this isn't supposed to happen with a natural right that's specifically protected within the U.S. Bill of Rights.
Despite the best efforts of those in the gun-control crowd to paint America's gun culture as "fringe" and "extreme," this couldn't be further from reality.