Even if you were correct, the unlikelihood of new insights is hardly good reason to not keep investigating and searching for useful answers, especially at a time when we could really use them to help us act intelligently. I'd rather try and find out as much as possible, than be stuck at the mercy of the powerful emotions surrounding the issue of gun control. Obama's executive orders empower the medical, mental health, and law enforcement communities to find more answers through their efforts, and with luck could help us uncover more facts than we had known prior.

I'm no more than an amateur at understanding US history, however I am aware that the Bill of Rights was created to empower Americans against the government, and not to give the government greater rights over citizens than needed to promote "life, liberty, and the pursuit of happiness". However, the Bill of Rights was also not enshrined as a dogma to not be questioned or changed as times called for them. What was written in the constitution was what, at the time, the United States needed to provide a country safe for democracy and liberty. Part of that was establishing a militia of armed citizens, due to the lack of a standing military force. This is no longer the case, to my knowledge. Whether or not gun ownership is inherently needed to promote the safety and freedom of American citizens is debatable. It has been a while since I've done any careful reading on the history around the Bill of Rights specifically, so perhaps I should be sure to brush up soon. If you have any good books, do share.