As of Sunday, we still don't know what caused Paul Anthony Ciancia to target TSA employees at LAX, but again we have the intersection of someone who may be suffering from mental illness and high powered weaponry. I've seen reports that he had 100 rounds of .223 ammunition on him, and he could have killed far more people than he did.
We're so desensetized to random violence that the only time it bubbles up to the national conciousness is when something like this happens. There are, on average, about 27 gun deaths per day in this country, and that doesn't include suicides.
Frankly, given our laws, lobbying and political climate, I don't know what can be done. There should be a way to keep these firearms out of the hands of the mentally ill while not infringing on well established citizen rights, but how long will this madness go on?