Without the 2nd amendment all other amendments fall, starting with 1st.
Quite true. The defense of liberty keeps liberty alive given the nature of government is to accrue power over the individual until stopped. But guns alone are not sufficient. One dicatatorship can replace another one by force. There must be a codified legal framework of liberty such as the Bill of Rights.
Obama loves the Patriot Act, a deadly assault on the Bill of Rights, despite railing against the act (like the liar that he is) during his 2008 campaign He twice signed an intact extension of this actrocity that guts the Fourth Amendment among others.