San Bernardino Police Chief Jarrod Burguan describes a shooting that took place at a center for people with developmental disabilities, killing at least 14 people and injuring 14 others. (Reuters)

Every time I write about mass shootings -- after Lafayette, and Charleston, and Umpqua, and Colorado Springs, and now San Bernardino -- I keep coming back to a profoundly sad quote from The Economist in the aftermath of the Charleston shooting. It captures just how immune the nation has become to major gun violence incidents, now 355 mass shootings just this year, and why we haven't done much about it.

The excerpt sums up the reality of our relationship to gun violence in the absence of any political will to address the problem (emphasis added):

The regularity of mass killings breeds familiarity. The rhythms of grief and outrage that accompany them become — for those not directly affected by tragedy — ritualised and then blend into the background noise. That normalisation makes it ever less likely that America's political system will groan into action to take steps to reduce their frequency or deadliness.

Those who live in America, or visit it, might do best to regard them the way one regards air pollution in China: an endemic local health hazard which, for deep-rooted cultural, social, economic and political reasons, the country is incapable of addressing.

This may, however, be a bit unfair. China seems to be making progress on pollution.

The shootings have become routine. Our reactions to them have become routine. Exhortations from political leaders to not let the shootings become routine have also become routine.

More from Wonkblog:

The San Bernardino shooting would be the second mass shooting today and the 355th this year

People are getting shot by toddlers on a weekly basis this year

San Bernardino shooting: 11 essential facts about guns and mass shootings in America