what reasons does parris give for thinking ha he exucutioms will lead to rebellion

Parris claims that there are rumors of a rebellion against the witchcraft proceedings in Andover. Hathorne reminds Parris that all have been happy with the Salem executions, but Parris reminds him that Rebecca Nurse and John Proctor are respected members of the community and their executions will not be taken as well. Parris suggests postponing these hangings, and admits that there seems to be dissatisfaction, as shown by the low turnout at Proctor's excommunication.

Parris worries for his safety, having found a dagger at his doorway.