The left is giddy now because it happened that one of the Nazis killed someone and they think they can hang that on Trump or his base. But sooner or later the shoe will be on the other foot---and yes, that's a prediction.
But if you step back and look at the trajectory where this is headed, the left is going to have trouble if they don't reign-in Antifa. If they continue to have cops stand down every time Antifa shows up, rightwing militia groups are going to step in and provide their own security.
Keep in mind Antifa does a lot more than shut down Klan Civil War monument protests.
These so-called 'anti-fascist' thugs show up any time there's a conservative speaker and/or someone who dares to call themselves Trump supporters. And it's been going on for months. They created mayhem at Berkeley over Ann Frickin Coulter. They did the same to that raging 'racist' Milo.
It isn't Antifa vs the Klan. It's Antifa vs the First Amendment rights of conservatives and Trump supporters.