The article is saying that there are more effective ways of combatting Nazi-ism than violence. That is an argument against violence.
> Historically, there has been exactly one solution for Nazis. It did not come cheap.
I read that as “punching Nazis isn’t enough on its own, you must kill them until they can no longer act effectively against you, then outlaw their ideology.”
And for those: no peace, no sympathy, no quarter, and no mercy."
Yeah...I don't think we read the same article.