Another perspective: he wants to make sure a coup is not mounted against him should recounts and legal challenges give him an Electoral College win. If he were to be the victor, presumably there would be riots in the streets. However he could not count on Esper and his allies to restore civil order. Trump’s lesson from the 2016 interregnum is that he was not sufficiently suspicious of the security apparatus and what it was plotting against him.
I would expect Trump to make policy changes and to grant a slew of pardons in the coming months. That is what Obama and Clinton did.