I'm almost convinced instead of looting, in many cases (at least here in WA) it's some sort of organized crime syndicate working with street level gangs using the civil unrest as cover to commit grand theft.
In DT Seattle, protests turned into violent riots, and many nearby businesses were damaged including looting.
In other WA cities, criminals picked strategic targets (Target, Walmart, and BestBuy) and hit them in multiple locations. In Bellevue, there was footage of cars pulling up to take the stolen possesions and drive away.
That was different than with looting, in which people typical take anything that isn't nailed down.