What happened is an act of terrorism, either foreign or domestic, and the facts are yet to be obtained.. so i will state that so far, gun laws are irrelevant (nobody shot anyone, and nobody shot the bomber) and crime statistics are also irrelevant as they simply do not apply.
So, although my personal views are that there are many many things wrong with the gun laws, societal structure and international image of the USA, whether or not these issues form any type of motive for the bomber is yet to be determined and hence speculative emotional rantings from all perspectives is not only misplaced, it is inappropriate.
So...can we PLEASE all calm down and discuss the matter nicely...