Burn It Down
The only thing those mobs manage to create is a shining example for all the rest of America what life is going to become when those forces take over. So far, those who want to radically reshape society were able to camouflage into the rest of America. Now they come out in the open, encouraged by those thugs in Seattle and some other cities. Sadly, some US cities will become economic and human wastelands. It will take decades until those parts of America will rejoin the civilized world. If ever.