Bruce Schneier calls the Boston bombings “something that almost never happens”:
Remember after 9/11 when people predicted we’d see these sorts of attacks every few months? That never happened, and it wasn’t because the TSA confiscated knives and snow globes at airports. Give the FBI credit for rolling up terrorist networks and interdicting terrorist funding, but we also exaggerated the threat. We get our ideas about how easy it is to blow things up from television and the movies. It turns out that terrorism is much harder than most people think. It’s hard to find willing terrorists, it’s hard to put a plot together, it’s hard to get materials, and it’s hard to execute a workable plan. As a collective group, terrorists are dumb, and they make dumb mistakes; criminal masterminds are another myth from movies and comic books.
Douthat hopes that we will respond rationally:
Today’s attack, on the kind of event that countless cities hold and that even the most omnicompetent police force couldn’t make entirely secure, could easily lead to a further ratchet, a further expansion of preventive (or preventive-seeming) measures, a further intrusion of bureaucratic and paramilitary rituals into the rhythms of everyday life. Or it could be an opportunity to recognize the limits of such measures, the impossibility of achieving perfect security, and the costs of pretending that an extra ring of barriers and inconveniences will suffice to stop a determined evil from finding its way through.
We really do have to adopt a more stoic response to these acts of evil. It is the only long-term thing that deprives them of their power.