A Jan. 6 report should be just the beginning. Just like the riot was

The details are scary, but not surprising to some of us.

Capitol Police intelligence officers had warnings as early as Dec. 21 of what was going to happen on Jan. 6 at the Capitol: Pro-Trump protesters were planning to “bring guns” and other weapons to confront the police — the “blue” that conservatives swear they “back.” Lawmakers were in danger of being trapped and harmed while doing the job they were elected to do, certifying the election of President Joseph R. Biden Jr. (though quite a few Republicans shamefully failed even that routine task post-insurrection). Conspirators giddily shared maps and discussed entry points.

And nothing.

A few Capitol Police command officers did get some information, which they failed to share widely. According to the department’s statement: “Neither the USCP, nor the FBI, U.S. Secret Service, Metropolitan Police or our other law enforcement partners knew thousands of rioters were planning to attack the U.S. Capitol. The known intelligence simply didn’t support that conclusion.”

Known intelligence? Anyone paying attention to the social media bragging of self-styled “militia” members, Oath Keepers, Proud Boys, red-state secession groupies, white supremacists and their ilk could have figured it out. Those swept up in QAnon delusions and Donald Trump’s “big lie” of a stolen election excitedly posted travel plans and loving photos of weaponry, all shiny and ready for action. The dry run of a Unite the Right rally in Charlottesville, Va., where a woman was killed, happened in 2017 — and that was over a statue. And just last year, armed Michigan militia members swarmed a state capital and plotted to kidnap a governor.

In preparation for the insurrection, Trump himself issued a pretty vivid invitation, one of several: “Big protest in D.C. on January 6th,” he tweeted on Dec. 19. “Be there, will be wild!”