Prohibition was kneecapped by Americans' widespread refusal to stop producing, selling, and drinking booze. Millions of Americans smoked marijuana decades before majority sentiment creeped toward legalizing the stuff. Gays and lesbians not only surreptitiously lived and loved when they were targeted by the law—they also famously (and righteously) stomped cops who raided the Stonewall Inn, ultimately precipitating liberalization. And restrictions on exporting encryption were eased only after cryptographers illegally exported code—even printing it on T-shirts as an act of civil disobedience. But in the wake of Omar Mateen's bloody rampage in Orlando, gun control advocates think that overcoming the passionate opposition of firearms owners and imposing a ban on a difficult to define class of "assault weapons" is a swell idea whose time has come. This prohibition will somehow be different. "Those who defend the easy accessibility of assault weapons should meet these families and explain why that makes sense," President Obama tut-tutted last week. But the moralizer-in-chief failed to make sense himself, calling for the outlawing of a category of devices that doesn't really exist. "The term assault weapon itself, of disputed origin, is a thorn in the side of gun enthusiasts, who point out that the differences between 'assault weapons' and other semi-automatics are largely cosmetic and don't increase the gun's lethality," explains Slate senior editor Rachael Larimore, in a piece taking the media to task for reporting and editorializing on guns without getting the facts straight. "Because these guns are really just ordinary rifles, it is hard for legislators to effectively regulate them without banning half the handguns in the country (those that are semiautomatic and/or have detachable magazines) and many hunting rifles as well," adds UCLA law professor and gun control advocate Adam Winkler, who has actually done his research. Winkler also emphasizes why gun owners are so hardened in their opposition to further legal restrictions: "Gun control advocates ridicule the NRA's claim that the government is coming to take away people's guns, then try to outlaw perhaps the most popular rifle in the country." Gun owners' response is best summarized by one of their more popular slogans of recent years: "Molon labe." Usually translated as "come and take them," that was Spartan King Leonidas I's legendary response to the Persian demand that he and his men surrender their weapons before the Battle of Thermopylae. That gun owners mean what they say in the "assault weapons" context can be inferred from the 5 percent compliance rate achieved by New York's recent registration requirement for such firearms. Or from the 15 percent compliance rate in neighboring Connecticut. In 1990, even before opposition had become so hardened, California experienced similar resistance to its original restrictions on "assault weapons." "As a one-year registration period draws toward an end on Dec. 31, only about 7,000 weapons of an estimated 300,000 in private hands in the state have been registered," The New York Times reported. When New Jersey went a step further and banned the sale and possession of "assault weapons," 947 people registered their rifles as sporting guns for target shooting, 888 rendered them inoperable, and four surrendered them to the police. That's out of an estimated 100,000 to 300,000 firearms affected by the law. The New York Times concluded, a bit drily, "More than a year after New Jersey imposed the toughest assault-weapons law in the country, the law is proving difficult if not impossible to enforce." Some advocates of restrictions will object that they "don't want to take away" existing guns—they just want to prevent the acquisition of new ones. That narrative becomes complicated when officials like New York Governor Andrew Cuomo muse that "Confiscation could be an option"—a sentiment echoed by the New York Times editorial board. But let's go with it. So, the government somehow defines "assault weapons" in a meaningful way and bans sales of new ones. How is that going to be effective given the millions of disfavored weapons already in circulation? That includes roughly 8 million AR-15-style rifles alone—out of somewhere north of 300 million firearms in general. It's not like they're going anywhere. Plenty of 19th century firearms are still in working condition. And their numbers will increase, even if commercial production and sales are outlawed. People have been 3D-printing AR-15 lower receivers (the parts legally classified as a firearm) for years. More durable receivers are CNC-milled by hobbyists from partially finished blanks as well as raw blocks of metal. These techniques were developed in anticipation of the laws now proposed, with the specific purpose of rendering them impotent. Molon labe, remember? So, a United States the morning after, or a year after, or a decade after a successful effort to ban "assault weapons" will not be the scene of the "domestic disarmament" favored by prominent communitarian sociology professor Amitai Etzioni. It will be more like Prohibition-era America, but with hidden rifles substituting for stockpiled hooch and 3D printers standing in for moonshiners' stills. And probably a bit more tense. Those defiant gun owners will also be included in the jury pools chosen to sit in judgement of unlucky violators scooped up by law enforcement. That situation will likely replicate the difficulty prosecutors had in getting convictions of Prohibition scofflaws in the 1920s and marijuana law resisters today. "f juries consistently nullify certain types of criminal charges (charges for possession of a small amount of marijuana, for example), this can render an unpopular law ineffective," wrote John Richards at the LegalMatch blog after a jury couldn't even be seated in Montana. "If you pass laws that people have no respect for and they don't follow them, then you have a real problem," Connecticut Sen. Tony Guglielmo (R-District 35), told the Hartford Courant when large numbers of state residents flipped the bird to lawmakers and defied the new gun law. Well... yes, you do. And like their restriction-inclined predecessors, gun controllers will have quite a mess on their hands. What Will Gun Controllers Do When Americans Ignore an ‘Assault Weapons’ Ban?