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You can almost see these words in a gunmaker's advertising brochure: "Like the Swiss Army Knife, the popular AR-15 rifle is a perfect combination of home defense weapon and homeland defense equipment. Good for both home and battle … ." But actually, they're the opening phrases of a federal court ruling last week that threw out California's 30-year-old ban on assault-style weapons.

There's a lot to object to in the decision by District Court Judge Roger T. Benitez, beginning with his cynical attempt to redefine deadly firearms patterned after combat arms as just some old thing folks keep around the house to kill the odd intruder and maybe toddle off to the shooting range to use for a little fun.

In fact, assault-style weapons — which have been highly controversial since at least the 1980s — are designed for a singular purpose: to kill a large number of people in a short period of time. The fact that some hobbyists enjoy using them to pop off a few recreational rounds does not outweigh what the weapons are capable of, and why they do not belong in the hands of civilians.

California, in fact, broke the ground for banning the weapons after the 1989 incident at a Stockton schoolyard in which a man wearing military-style fatigues, a flak vest and ear plugs used an AK-47 to fire more than 60 rounds in sweeps across a playground crowded with hundreds of children, killing five of them and wounding 30 other students and adults before shooting himself.

Such a mass shooting was a rare event at the time, and it sparked action. Congress followed in 1994 with a federal ban but compromised by including a 10-year sunset clause, allowing the ban to expire in 2004. The Benitez decision, if it is allowed to stand, would reset California back to 1989.

It's worth noting that at the time of those bans, few people owned assault-style weapons (the industry has tried to rename them "modern sporting rifles," which sounds much more benign). No accurate count is available because no government agency has kept track, but experts say that after the federal ban expired, production and sale of such weapons increased significantly.

The rise was especially noticeable after the election of President Barack Obama and mass killings at a Newtown, Conn., elementary school and an Aurora, Colo., movie theater — not because consumers feared home or foreign invasions, but because gun aficionados began to worry that the government was about to cut off access to the machines of mass death.

So how many of these weapons are in circulation? Again, the numbers are sketchy, but probably around 20 million nationwide, according to the National Shooting Sports Foundation, a gun industry trade group. That's a small fraction of the estimated 350 million firearms in private hands in the U.S. That's not very common in a nation of this size, though the Supreme Court, which set that common-use standard, hasn't bothered to define it.

It's hard not to see the sharp increase in production and sales of assault-style weapons as an effort by Second Amendment hardliners to try to get the deadly weapons into more hands to make the spurious argument that they are now in common use. It's galling that a federal court would buy into that reasoning, which is what Benitez has done here.

The U.S. is an outlier among industrialized nations when it comes to the number of firearms in civilian hands and the rate at which people use them to kill others and themselves. Even the Supreme Court's controversial 2008 Heller decision, which for the first time recognized (wrongly) an individual right to keep a gun in the home for self-defense, also said that the government has an interest in regulating firearms and that "the right secured by the Second Amendment is not unlimited."

This is a good point at which to maintain limits. The Second Amendment was framed against a backdrop in which the U.S. government had no standing army, and the Founders saw the need for individuals to own guns they could bring with them when entering militia service. We don't operate our military that way anymore, which means individuals have neither a need nor a right to possess firearms designed for battlefields.

FROM AN EDITORIAL IN THE LOS ANGELES TIMES