But the number of federal agents sent to create problems was large and obvious.

lol! What "problems"? Your corporate media reported no "problems". The feds, with whom antifa collaborates to identify and jail rightwing activists, deny antifa's existence as "just an idea".

Do you see how silly it is for you to try to wring a classical "standing on the ramparts athwart the system" narrative from the left's system-endorsed escapades of this past summer?

Was anyone murdered by the police? I don't remember.

I'll refresh you. No. None. At worst, some pepper spray and beanbags, at which point the authorities over the cops stepped in and told the cops to stand down. Antifa-BLM committed several murders however. Several of the victims will never see justice because the system is united in seeing that their paramilitaries are free of the stain of unfortunate happenings. Such as when Antifa-BLM murdered eight year-old Secoria Turner, unloading into the windshield of her mother's car because she drove to close to the Wendy's franchise location they had burned down and were holding as an "autonomous zone". No justice for the cold-blooded execution of two unarmed teens at "CHAZ". Antifa-BLM murdered with impunity, the identities of it's murderers held in confidence behind a thin red line of sorts.

In all, the left's summer of terrorism claimed fifty lives, all of which are forgiven by the system. Contrast this with the system's posture toward conservative demonstrations, in which incidental deaths fomented by opponents (an obese commie struck by a fleeing motorist, an unarmed protester shot dead by a cop) mark the events as 'deadly' and are leveraged as cause to repress all political speech and activity possessing similar sentiments.

Of course we saw them allowing militia to do that for them. And anything else they wanted.

I can count one incident of a citizen setting out to defend his community from antifa-BLM terrorism and tagging a bolshevic, in Kenosha. The "victim" was seen on video daring the defender to shoot him, before pursuing the defender into a position of no escape, forcing the defender to fire in self-defense. The "victim", Joseph Rosenbaum, was, perhaps as a matter of statistical probability given his political leanings, a convicted five-time child rapist. Nothing of value was lost. The city still burned as organizers forewarned local officials through open backchannels of the sort which are available to no conservative activists. Despite the circumstances, the defender, Kyle Rittenhouse was swiftly jailed and faces trial for "murder". The international banks stepped in to deny Rittenhouse access to crowdfund his defense.

The only other case I can recall is the one in Austin when an Antifa gunman stopped a motorist and pointed his rifle at him and was shot dead, again in self-defense. Although I believe the state stepped in on antifa's behalf and are also prosecuting that as if it were a homicide. It seems that when the far left fucks around, they find out that the hegemon has their backs.

It's really impossible for a sane person to not believe what they're finding in terms of co-conspirators ...

Conspiracy theories like this do not explain the state violence during or following the event. To encapsulate, there was an peaceful occupation of the people's house by ordinary working men and women and the state responded with deadly force and have followed up with an absurd display of security theater amid a nation-spanning manhunt for protesters aided by doxxes and "open source investigation" provided to the feds by antifa and antifa-adjacent journalists. Yes, an unusually small Capitol police force were overwhelmed. Given the unprecedented repression and reprisal focused on conservatives in the wake of the event, the ease with which the Capitol was occupied is better explained as a planned pretext for rolling up and jailing as many rightwing dissidents as possible at the close of the Trump administration.

It also obscures the essentially anodyne nature of the protest, in which amid some clashes with police, unarmed protesters merely walked around, minding rope-lines, destroying nothing and taking selfies with their feet up on the desks of mercurial officials. I think this best explains the angst progressives have displayed about the demonstration; They see this spontaneous uprising and the extent to which it pierced the egos of the powerful and they recognize how it contrasts with their year-long campaign of state/oligarchy-approved burning, looting and terrorizing of workingclass communities.