We spend billions of dollars so TSA agents can pat down grandmothers but cannot protect the very heart of our national government. Pathetic.
What would you have done if you were the Park Service, Secret Service or whomever?
Shot at him with a Stinger, sending flaming debris raining down on tourist walking the sidewalks?
Arrest him two years ago on suspicion of "grumbling and distrust of the Federal government"? ("You Freepers, line up to the right and await your turn for handcuffs!")
Complete defense of a large, open access area is almost impossible.