From the OP: ‘The additional, mostly unsung verses only add to the heavy impression. One line says: The foes haughty host in dread silence reposes. Another mentions the havoc of war and the battles confusion. The final verse refers to peace as a blessing.’
I have to say that the line ‘Their blood will wipe out their foul footstep’s pollution’ might be a little hard core for pacifists. On the other hand it is virtually never sung.
There's so much to torture a weenie in just a few lines. How great is the closer of the final verse:
Then conquer we must,
When our cause it is just,
And this be our motto,
'In God is our trust.'
And the Star-Spangled Banner in triumph shall wave,
O'er the land of the free and the home of the brave!