There were a great many purposes that I see, here:
1) The “performance” was WH-controlled, Internet-only - if you can do this, you can do anything.
2) It was held inside razor-wire put up at a moment’s notice - as good as red lighting with Marines in the background.
3) Our entire Federal Government was trained to enter the razor-wire like sheep entering a chute - this will come in handy, later.
4) The “performance” produced probably the only campaign footage team-Biden may have available before November - his doctors probably know the trajectory he is on, at this point.
America’s transformation into Red China is proceeding on schedule.
Well observed. Thanks.