An armed Arlington SWAT officer stands guard at the AT&T Stadium tunnel entrance before the Big 12 Championship between the Oklahoma Sooners and TCU Horned Frogs at AT&T Stadium in Arlington on Dec. 2, 2017. (Tom Fox / Staff Photographer)It is often said by people of all political persuasions, and certainly by my fellow conservatives, that the primary duty of the federal government is to keep us safe. The problem is, that's not true. The founding documents, the Declaration of Independence, the Constitution, and especially the Federalist Papers, make it clear that the primary duty of the federal government is...