"Why do you need an AR15?"

[BjornF16]

Only one person created the Second Amendment. http://www.billofrightsinstitute.org/fou...of-rights/

From your source, emphasis added:

The first 10 amendments to the Constitution make up the Bill of Rights. Written by James Madison in response to calls from several states for greater constitutional protection for individual liberties, the Bill of Rights lists specific prohibitions on governmental power. The Virginia Declaration of Rights, written by George Mason, strongly influenced Madison.

So it wasn't just thought up/created by one man as you infer. Without the Bill of Rights, there would have been no Constitution.

Some of the many Patriots who advocated for the RKBA were: Samuel Adams, Patrick Henry, George Mason, Thomas Jefferson, George Washington, John Adams...the list goes on.

Try reading: The Founders Second Amendment: Origins of the Right to Bear Arms by Stephen P. Halbrook