The rug micturation is a metaphor for antisocial aggression.
From the casual invasion of someones private residence to the casual invasion of someones country.
Hence the 'This aggression will not stand' reference to the invasion of Kuwait.
The Dude/Kuwait are at a loss as to what to do until Bush/Walter speak up and join in.
Donny/innocents die,nihilists/fundamentalists trash things,balls roll/oil flows and Iran/Jackie Treehorn sits gloating in the shadows because they have what the west desires.
Probably why there is no resolution at the end of the movie.