Why? Because the Supreme Court has declared that the Constitution forbids it. Because a sizable chunk of the country strongly opposes it. Because America’s democratic culture would never allow the mass confiscation of property by the government. When that property is a weapon that could be trained on the person attempting the confiscation, things get trickier still.
There is simply no realistic path that gets us from the country we have to the country gun-control advocates want.
Should we try to pass more laws regulating guns? Absolutely. If your city is motivated to ban high-capacity gun magazines, by all means do so. The same with local, state, or federal laws encouraging the development of childproof guns and public-health efforts to persuade people to buy them. The same with increasing waiting periods, deepening background checks for gun purchases, and closing the gun-show loophole. Go ahead and do every well-intentioned thing in Nicholas Kristof’s indignant column on the Roanoke shooting.
But understand that in the end the improvements will only be marginal.