You are taking what amounts to a few minor incidents involving some stupid kids, and then acting like they represent an existential threat to the United States.
Do you know how often skinheads get into violent altercations? All the time. They get into street fights, bar fights, etc.. Those aren't the reason we think white power organizations are threatening. We think they are threatening because of the murders and deadly terrorist attacks they get involved in.
Anti-abortion violence is many times more common and more extreme than anything antifa has ever done, and do you really expect me to believe that you spedn 1/100th of the time talking about anti-abortion violence that you spend talking about antifa? Your preoccupation (obsession) with antifa is because you want to use it as a tool to push a political agenda, not because of genuine concern.