As each new mass shooting leaves dead and wounded Americans strewn like casualties on a battlefield — a butcher’s toll that has now intersected with the international terrorist threat — the gun industry’s culpability amounts to war profiteering through the reckless sale of military weapons tailored for the civilian homefront.

Across recent decades, gun manufacturers, facing a decline in general gun ownership as demographics shifted and sports hunting faded, have cynically created a domestic market for barely altered rifles and pistols developed for the military. These are weapons designed for the rapid spray-shooting of multiple enemy soldiers in wartime, not homeland civilians living in peace.

Yet the latest casualty count of 14 killed and 21 wounded last week in the gun carnage at San Bernardino, Calif., is another horrendous confirmation of how these easily available weapons — marketed as macho tools for a kind of paramilitary self-defense — are being used again and again for rapid-fire attacks on innocent people. The fact that the California killers were self-proclaimed Islamic warriors makes the ease with which their arsenal was assembled all the more outrageous.

While lurid-looking rifles may cause the most shock in the public aftermath, the industry has also been selling pliant statehouse politicians on the legalization of “concealed carry” handgun licenses. These are spreading powerful semiautomatic pistols with the firepower of rifles through the civilian population, from bar rooms to college campuses, even as evidence mounts that they cause more harm to innocent victims than to fantasized malefactors.