How big a massacre would it take before a gun control law would be carried by a majority in the US? You know this is the same exact tactic the FBI is playing t

How big a massacre would it take before a gun control law would be carried by a majority in the US? You know this is the same exact tactic the FBI is playing to advance their goal of warantless access to web history, right? But it's different, one may say. One scenario uses the swelling of strong emotion after a news event to try and pass a law curbing constitutional rights. And the other scenario ___________________.