Of course they have to be threatening. They demand to be treated like prophets after proving that they're frauds, and nobody is allowed to question their flip-flopping teachings even those most dubs can't keep straight what the nulite is.
WT leadership is following the example of any number of dictators that will use propaganda and violence. Anyone that isn't 100% following the party is an enemy of the state, a traitor that deserves to be killed. At WT, anyone that isn't 100% following the "faithful slave" is an apostate, a satanist that deserves to be ripped away from their friends and family.