Why America should outlaw spanking.

Sally Lieber, the California assemblywoman who proposed a ban on spanking last week, must be sorry she ever opened her mouth. Before Lieber could introduce her bill, a poll showed that only 23 percent of respondents supported it. Some pediatricians disparaged the idea of outlawing spanking, and her fellow politicians called her crazy. Anyone with the slightest libertarian streak seems to believe that outlawing corporal punishment is silly. More government intrusion, and for what—to spare kids a few swats? Or, if you're pro-spanking, a spanking ban represents a sinister effort to take a crucial disciplinary tool out of the hands of good mothers and fathers—and to encourage the sort of permissive parenting that turns kids ratty and rotten.

Why, though, are we so eager to retain the right to hit our kids? Lieber's ban would apply only to children under the age of 4. Little kids may be the most infuriating; they are also the most vulnerable. And if you think that most spanking takes place in a fit of temper—and that banning it would gradually lead more parents to restrain themselves—then the idea of a hard-and-fast rule against it starts to seem not so ridiculous.

The purpose of Lieber's proposal isn't to send parents to jail, or children to foster care, because of a firm smack. Rather, it would make it easier for prosecutors to bring charges for instances of corporal punishment that they think are tantamount to child abuse. Currently, California law (and the law of other states) allows for spanking that is reasonable, age-appropriate, and does not carry a risk of serious injury. That forces judges to referee what's reasonable and what's not. How do they tell? Often, they may resort to looking for signs of injury. If a smack leaves a bruise or causes a fracture, it's illegal. If not, bombs away. In other words, allowing for "reasonable" spanking gives parents a lot of leeway to cause pain.

Who should we worry about more: The well-intentioned parent who smacks a child's bottom and gets hauled off to court, or the kid who keeps getting pounded because the cops can't find a bruise? This U.N. report on violence against children argues that "The de minimis principle—that the law does not concern itself with trivial matters" will keep minor assaults on children out of court, just as it does almost all minor assaults between adults. The U.N. Committee on the Rights of the Child has been urging countries to ban corporal punishment since 1996. The idea is that by making it illegal to hit your kids, countries will make hurting them socially unacceptable.

The United Nations has a lot of converting to do in this part of the world. Its report cites a survey showing that 84 percent of Americans believe that it's "sometimes necessary to discipline a child with a good hard spanking." On this front, we are in the company of the Koreans, 90 percent of whom reported thinking that corporal punishment is "necessary." On the other side of the spanking map are 19 countries that have banned spanking and three others that have partially banned it. (Here's the list.)

The grandmother of the bunch is Sweden, which passed a law against corporal punishment in 1979. The effects of that ban are cited by advocates on both sides of the spanking debate. Parents almost universally used corporal punishment on Swedish children born in the 1950s; the numbers dropped to 14 percent for kids born in the late 1980s, and only 8 percent of parents reported physically punishing their kids in 2000. Plus, only one child in Sweden died as the result of physical abuse by a parent between 1980 and 1996. Those statistics suggest that making spanking illegal contributes to making it less prevalent and also to making kids safer. On the other hand, reports to police of child abuse soared in the decades after the spanking ban, as did the incidence of juvenile violence. Did reports rise because frustrated, spanking-barred parents lashed out against their kids in other ways, or because the law made people more aware of child abuse? The latter is what occurred in the United States when reports of abuse spiked following the enactment of child-protective laws in the 1970s. Is the rise in kids beating on each other evidence of undisciplined, unruly child mobs, or the result of other unrelated forces? The data don't tell us, so take your pick.