Ghost guns aren’t yet one of America’s biggest threats to life and limb — handguns and especially illegal handguns are a bigger menace by far — but the country would be inviting bloodshed to wait until they climb the grim charts to try to contain their pernicious spread. This is why we’ve praised state Attorney General Tish James for doggedly pursuing those who illegally ship parts to build such firearms to New York, and why President Joe Biden was wise last year to direct the Bureau of Alcohol, Tobacco, Firearms and Explosives to better police the ready-to-assemble weapons. What makes legal f...