You should give it another viewing. There’s violence, but it’s not just random murder for its own sake like in The Purge. The protagonist carries out a series of targeted assassinations against people who were involved in detaining and experimenting on him in a concentration camp, and blows up a couple of empty buildings at the beginning and end of the movie in a symbolic act of defiance against a fascist regime. There’s a bit towards the end where he ships a bunch of guy fawkes masks to everyone and there’s some robbing and looting, but no killing until a secret police guy shoots an unarmed child in the street and some people jump him. The plot overall is about people rising up against and toppling a fascist regime, which is pretty relevant to current events.