Seattle deserves anarchy. Let them enjoy it for a few months. Then, when Trump is ready, place a second set of barricades around the zone and don’t let anyone back it. You can get out, but no admission. Ended in three days without a shot. It might help to cut off the water.
And, they need time to let the shine wear off their new skateboard. A couple of murders, robberies, and rapes in the free zone will make the experience less than a Woodstock moment.
I favor the Escape From New York approach. And there ain’t no Snake Plissken on either side of the barricades. Make ‘em hurt.