One might want to become a citizen in order to be able to vote and more fully participate in the business and live of our nation. Through out our history so many people have chosen to become part of the United States, not just a guest.
"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper