Hours after pro-Trump rioters stormed the Capitol, Antifa tried to break into the Multnomah County Courthouse in downtown Portland. A mob of black-clad Antifa militants proceeded to smash businesses and public buildings using hammers. On one wall, they spray-painted an Antifa logo and the warning, “The state can no longer suppress us.”

Protesters then confronted Mayor Wheeler at a restaurant and hit him. But by morning, no national media had reported on the anti-government violence in Portland — the third riot in the city since New Year’s Eve.

The upshot should be clear: The deadly storming of the Capitol building is the logical outcome of norms set by the left in 2020. By winking at and apologizing for Antifa, liberal elites telegraphed that political grievances ought to be resolved through violence.

Those showing righteous indignation now only months or weeks ago argued that the riots were “mostly peaceful” and that vandalism and looting don’t count as violence.

That’s the problem with political irresponsibility: Once the law grants quasi-authorization to hitherto-proscribed conduct, there’s no telling how events might spiral.