Those who begin coercive elimination of dissent soon find themselves exterminating dissenters. Compulsory unification of opinion achieves only the unanimity of the graveyard.
Down through the centuries, this trick has been tried by various establishments throughout the world. They force people to get involved in the kind of examination that has only one aim and that is to stamp out dissent.
People may believe that there can be a society where dissent is not permitted, but which is nonetheless not a fear society because everyone agrees with one another and therefore no one wants to dissent.