My opinion.
Trump allowed Antifa infiltrate and get inside Capitol Hill. This for the DS was about framing POTUS and the Trump Supporters. For us.. the end game goal was being able to declare the NG, because as soon as Trump told everyone to disperse, it actives insurrection act.
(((they))) thought it would be a simple frame job. Potus only needed them to get inside Capitol Hill and then bam.