It seems the police actually arrested violent instigators, which makes them far more impressive than the American police, which typically sits on their ass and does nothing with regards to cement-throwing thugs.
do you have any examples that don't involve Portland?
The 9th Circuit, generally not considered a bastion of conservatism, has acknowledged that the City of San Jose intentionally sparked political violence by throwing right-wing protestors and Antifa types in one crowd and then immediately standing down.
https://sanfrancisco.cbslocal.com/2018/07/27/trump-supporters-score-legal-victory-suit-san-jose-police/American police in large urban areas, presumably the areas that require most of the policing, have consistently proved themselves worthless.