BECUASE THE WAR WAS F@#KING OVER
Except it wasn't.
The Founders hadn't surrendered at that point. The Dominion forces hadn't stopped hostilities. The JemHadar had no orders to stand down.
The Cardassians (who had switched sides) were on the verge of being attack by the Dominion.
Without the bargining chip of the cure, Starfleet would have engaged in a battle whose end result is completely unknown.
So how was the war (in any way) "over."