The phenomenon of a rush-to-panic at the SB shooting with calls to action (re-action) is now being discussed on the news in relation to the other mass-shootings.
Consider that adding the prior experiences of Lanza, Holmes, Dear, Roof etc. to the most recent of Farook/Malik would answer the question "What is my risk of being a victim in a mass-shooting?"
But the link between Farook-Malik and the murky origins of their radicalization has suddenly raised the war alarm. This last killing has a more tangible, likely cause. Whether it's guns or something else, everyone seems to accept these other shootings as "facts of life."