1/3 of US taxes go to security and military

http://newsjunkiepost.com/2011/04/15/tax-day-a-third-of-your-tax-money-is-spent-on-wars-and-security/

Are we really this paranoid?  Are we still over-reacting from 9/11?  We also hold the most prisoners in the world.  Why?  Are we the worst people in the world that we must incarcerate such a large number of our fellow citizens?  Is the rest of the world so bad that we must maintain a military larger than all other militaries put together?  Is this the kind of world we want?