Why is Danforth especially nervous about rumors concerning events in Andover? What reasons for receiving no pleas for pardon or for postponement of the executions?

Parris claims that there are rumors of a rebellion against the witchcraft proceedings in Andover. This worries Danforth that people might rebel and his influence will be finished. He would also be worrying about his own safety should people get angry enough. Stll Danforth cannot relinquish his power. Not killing the people would weaken his court and his position.