Spoon,  Provided below is a link to our First Congress' debate over the second amendment.  So let's let them answer your question. 
 If you don't cherry pick your quotes, you will get at why the Founders adopted the 2nd Amendment.  The Founders had one overriding fear, that was the fear of a tyrannical government in any form; foriegn, federal, or state.  They were least worried about state government because it was assumed it was the most representative and free of tyranny being closest to the People.  But US history has shown that state governments have been tyrannical also; one example, slavery.

http://www.constitution.org/mil/militia_debate_1789.txt