There is no way this makes sense from a political point of view, I agree. But it does make sense if those not in the news are pressuring the administration to act the way they are. As with all things in politics, as FDR said, "Nothing in politics happens by accident. If it happened, someone wanted it to happen."
So the main question is: How stands to gain from:
(1) allowing illegals to cross and stay out of the system; or
(2)who benefits from creating an immigration controversy so that there is a reaction to that controversy?
What reaction could be expected? If you can answer these questions, the reason for the open borders and the controversy at this time will be better understood.
Is this all a massive distraction?
Good points to ponder.