Why DC is different? Bellevue and Kirkland in Seattle expected visitors with AR-15s.
AFAIK, I didn't hear of anything similar happening in Seattle or Bellevue. Personally, I'm in Seattle (Belltown), and other than Saturday the curfew has been pretty lax.
Are you saying residents there own AR-15s? I'm aware DC has very strict gun laws while Washington (state) is more pro-gun. But on the flip side, I'm not aware of protesters holing up in private residences.
So I don't see where your comment has merit. Can you clarify?