Jehoiada made a covenant between the LORD and the king and the people, that they should be the LORD's people; between the king also and the people. 2 Kings 11.17And as God’s people, they would destroy the religious symbols of all other Gods, and kill their priests. So God’s people went into a murderous rampage. They started by killing Mattan, the priest of Baal, at the altar.
All the people of the land went into the house of Baal, and brake it down; his altars and his images brake they in pieces thoroughly, and slew Mattan the priest of Baal before the altars. 11.18And finished by killing Queen Athaliah.
And all the people of the land rejoiced, and the city was in quiet: and they slew Athaliah with the sword beside the king's house. 11.20God's next killing: God sent lions to eat those that didn’t fear him enough