I think you're minimizing the impact of antifa psychos. And I'm no moderate. Antifa is explicitly about violence, racism, and is associated with the Dayton Ohio shooter as well as the recent attacks on the ICE facilities.
Antifa is literally about opposing fascism, which in America is a violent white supremacist and misogynist movement. When you say that they are "associated with the Dayton Ohio shooter" you mean that alt-right propagandists have found tweets from him that express negative sentiment toward fascists. I am now seeing that an armed man actually associated with a local antifa group recently got himself killed after he "tossed lit objects at vehicles and buildings, causing one car fire, and unsuccessfully tried to ignite a propane tank," so yes, you're absolutely right, they've escalated from milkshakes to mild property damage. Definitely an equal threat to the specific rightwing movement responsible for the vast majority of domestic terrorism in this century.