Revolutions don't start by someone going "Let's fucking kill the king". It would start as an underground thing and gain traction from there. Can Jack honestly say that his supposed loyalists are fully, one hundred percent loyal? He doesn't have secret police everywhere like some Orwellian nightmare. Code words. Secret meetings. Any number of possible methods to start and build a movement. Not even actual literal dictators controlled 100 percent of the population. 

He doesn't even have the support or loyalty of his [i]wife[/i] and yet the people are going to just take it all on the chin?