The right has an obligation to denounce white nationalists because white nationalists are perceived as being on the right. Those of us of the right need to be loud and speak clearly that they are not welcome among us. But the left needs to do the same with Antifa, which is nothing more than a kissing cousin of the white nationalists. One carries the swastika. The other carries the hammer and sickle. Both have the same means, violence, to accomplish the same ends of silencing those they disagree with it.
Joe Scarborough led a Morning Joe panel discussing Antifa and points out that they are as fascist as the fascists Antifa claims to oppose.