Why shouldn’t they advocate violence? Portland continues to encourage them to do so by not enforcing their own laws.
Portland is a hotbed of radical leftists and safe harbors them. At this point, we need to declare the city as seditionist and send in the national guard to take control, arrest both rioters and local politicians on charges of sedition, and reform their governance. If the state government intervenes, then they need to be arrested on charges of harboring seditionists and likewise put the state under martial law. Of course this would start a second civil war, but at this point I don’t see another more rational option. Whether Trump wins reelection or not, the civil war is coming whether we want it or not. Better to start it on our terms.