No Antifa, no cops waving people through, just a few people who knew it would be a good day to leave the place minimally defended.

Bowser declined fed support for security, she relegated the guard to traffic control.

The Capitol Police declined federal help, did not staff or equip well, and used weak barriers. They also did not respond quickly or in organization.

I would be inclined to think they were just incompetent. But if you want to dig for a conspiracy, try this route instead and let us know what you find.