The Second Amendment of the Bill of Rights does not “grant” Americans the right to armed self-defense, it simply recognizes and affirms this God-given human right. The Constitution, including the Bill or Rights, is a very succinct document that was written in plain English intended to be fully understandable by ordinary citizens, requiring no interpretation by judges. Article III of the Constitution discusses the responsibilities, powers and limitations of the Judiciary, including the Supreme Court.
Nowhere in the Constitution does it say that the Supreme Court is a super-legislature authorized to amend the Bill of Rights by a simple majority vote among its nine lifetime-appointed justices. In fact, Article III Section 2 explicitly grants to Congress the power to regulate which cases the Supreme Court may adjudicate at all. However, in the current political climate, with a toothless Congress abdicating its power to the Executive and Judicial branches, it is unlikely that the Supreme Court will be reined in and confined within its Constitutional limits.
My scenario for a second American civil war involves a Hillary Clinton victory in November 2016, followed in 2017 by the appointment of a Supreme Court justice politically to the left of Ruth Bader Ginsberg. The Second Amendment will then be gutted using a specious argument such as that the militia has “evolved” into the modern National Guard, meaning that there is no longer a right for private citizens to individually keep or bear arms. Liberal politicians and the collaborating liberal mainstream media will be in full-throated agreement with this false interpretation of the Second Amendment.