It says the people's right to bear arms shall not be abridged so there can be a militia. There is no mention of membership in any group. Consider: A well tuned car, being necessary to the security of people needing to evacuate in a storm, the right of the people to keep cars, shall not be infringed. Do we only allow people to have the cars if they live where they might have to evacuate? Can they only have the cars if they are members of the "Need to Evacuate" group? Can we take cars from people who have no need to evacuate--at least not at present?