Speculation: He knew the deep state was planning a false flag and to instigate Trump supporters into becoming violent.

The MSM narrative shortly after, despite peaceful, unarmed assembly and clean-up of the capitol building after the execution of the veteran, provides evidence for this.

They wanted to smear him and his supporters as white supremacists and terrorists in order to take them out once and for all.

Trump arrived late on purpose in order to separate his supporters and the false flag events.

This lead to the complete dissonance of MSM narrative and video footage of the protests and could well be part of their undoing.

They've pushed it too far, too quickly and too many times.