Why does Parris want to postpone the hangings?

Abigail has "flown the coup", so to speak. This exposes her as lier and discredits Paris. So, there is little remorse in Paris's pleadings for a stay in the executions. Parris is also scared because hee found a dagger in his front door, and is afraid that if respectable citizens like John Proctor and Rebecca Nurse are hanged, the town will revolt. Paris even starts to blubber like a baby, not because of all the suffering he has caused, but because Abigail stole his money before she left.