It'd be easy, but it'd be wrong. We need to be angry and empathize with the victims without being scared. Our fears would play right into the perpetrators' hands -- and magnify the power of their victory for whichever goals whatever group behind this, still to be uncovered, has. We don't have to be scared, and we're not powerless. We actually have all the power here, and there's one thing we can do to render terrorism ineffective: Refuse to be terrorized.