You elided the next sentence: "But it doesn't solve anything." which completely inverts the meaning of the sentence you quoted.
...which legitimizes the use of violence against "Nazi's" for whatever value you assign to that. Your quoted fragment just disclaims the effectiveness, while the article still clearly supports the idea.
> 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.