Kyle is going to make it through this quite well.
-There were operatives (FBI/DEA) in the process.
-There were other Federal agents watching certain folks as they crossed the border for attacks on Federal Buildings/Property. Jaedon X and others were there to "provide" video to their "customers".
-Antifa leaders and some members were being tracked in live and many videos posted.
-Kyle shows up and casually does his things throughout the day. Yes, he was egged on by many, but those weren't any of the [DHS] folks.
-Why do you think there are so many good videos of him and others?
That should answer a bit about your "what" and "why".
His presence was not necessarily anticipated. His actions prove his innocence.