The Second Amendment and a Point of Logic
I'll begin with the point of logic. For any X and Y, if X is a reason for Y, it does not follow that X is the only reason for Y. That should be self-evident. A reason need not be the reason. Now apply this to the Second Amendment of the Constitution of the USA. It reads:
A well regulated Militia being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.
The subordinate clause provides a reason why the right of the people to keep and bear arms shall not be infringed. It need not be interpreted as providing the sole reason, and it is obviously consistent with there being several reasons. And surely there are several reasons, which the reader can supply from his own intellectual resources. (Hint: consider the right of the individual citizen to defend himself against the criminal element.)
Now you know how to refute those who say that the gun rights guaranteed by the Second Amendment pertain only to militia members. Gun rights are no more group rights than free speech rights are.