The antifa slogan in Portland is “we own the streets.” And they do. The city has let it happen. Last October, they blocked a street and threatened drivers and passers-by who wanted to get through. A few months before that, they beat up a Bernie Sanders supporter who was carrying an American flag.

And it isn’t just Portland. We saw similar brutality in Washington, during President Trump’s Inauguration. Hundreds of rioting antifa members took over downtown DC. They marched in black bloc fashion, five abreast, their faces wholly covered, smashing windows and pushing people off the sidewalk. The police arrested 234 people, but not one of them was found guilty.

It’s the masks that save them. They’re a get-out-of-jail-free card. Deterrence doesn’t work when you can hide your identity. That’s a lesson we should have learned from the Ku Klux Klan.

Thanks to the masks, antifa won’t pay a cost. Instead, they will luxuriate in their sense of justified political hatred. They will also have the backing of prominent apologists in the liberal establishment, including Minnesota Attorney General Keith Ellison, who endorsed the antifa handbook, and CNN’s Don Lemon, who said in defense of the group that “no organization is perfect.”