The Supreme Court of the United States ruled that, “The right to bear arms is not granted by the Constitution; neither is it in any manner dependent upon that instrument for its existence” and limited the scope of the Second Amendment’s protections to the federal government. In United States v. Miller (1939), the Supreme Court ruled that the Second Amendment did not protect weapon types not having a “reasonable relationship to the preservation or efficiency of a well regulated militia”.

Am I missing something? How do these school shooters tie into a well regulated militia?