Simplest way to prevent these kinds of things is call for impeachment of almost every politician and the imprisonment of war mongers such as Anderson Cooper, Sean Hannity, Glenn Beck, and Rush Limbaugh... I've joked about this country becoming a police state one day to my friends and fam and now It actually is happening..
For how long I wonder? They're trying to pass a nation-wide federal firearm registration bill, where every gun owner has to register their guns with the Feds. This has been the first step towards banning firearms at many times throughout history.