I'm a little confused by the point you are making in this regard. You sort of touch on it and move on from the fact that an antifa member has justified his murder of another person by believing he was fighting a war.
White nationalism is an abhorrent philosophy. However, I don't see how antifa is the answer. Its a disorganized radicalized, for lack of a better word, organization and has been responsible for violence, murder, and wanton destruction. People who engage in guerrilla tactics and use physical force to intimidate and suppress.