Hathrone does not think Parris should be with the prisoners because the seems to be unstable. what proof does Hathorne give to support his claim?

Parris is unstable. He whines about Abigail fleeing town and stealing his money. He is also paranoid that the town is turning against him. He feels like a desperate man. Hawthorne doesn't want him messing with the prisoners spreading his fear and paranoia.