Ok, that came a little quicker than expected (cercei)
In a show with dragons and many faced gods and etc the most unbelievable thing going is a few score of religious fanatics took over "the new kings landing" and started locking up some elite players with impunity.
They represent the many. Remember when Tommen and a few Kings guard went to go speak with the high sparrow and his guys wouldnt let them in and said he was praying. The soldiers start to unsheath their swords and the entire community kinda stood up and looked like they were gonna revolt. Appears these guys have the support of the people.
I get it. The whole plot just seems off to me compared to the rest of the run of the show. Besides isn't the Queen supposed to be beloved by the people?
It reminds me of the riddle Varys poses to Tyrion in Season 1. In a room sits a king, a religious man, and a rich man, along with a common sellsword. They each tell the sellsword to kill the other two - the king says listen to me because I'm your lawful ruler, the septon says listen to me because I speak for the Gods, and the rich man says listen to me and I'll make you rich. Who survives?
Tyrion answers that it depends on the sellsword. Varys agrees, and then asks if the common sellsword has all of the power, why do we act like the king/septon/wealthy do? That leads to the whole "power is an illusion/a shadow on the wall" line. In this episode you had the High Sparrow say "You are the few, we are the many and when the many stop fearing the few..."
The truth is the Game of Thrones world, the king does not have an army. There is the City Watch, but they're basically regular dudes with a day job, and seem to be only as useful as whoever is in charge. When Tyrion made Bronn Captain when the city was about to come under siege by Stannis, Bronn had them round up all of the known thieves, and kill them ("Now we just have to worry about the
unknown thieves."). You can bet your ### that if Tyvin were still hand, this never would've happened.
But now, the king is a boy, the Hand is some doofus that the Queen Regent picked to ensure her place in power, and she herself made a deal with the devil letting the Faith arm themselves in exchange for wiping clean the crown's debt.
In short, she's ####ed. There's no one coming to save her, there's no one with any real authority at all in the city right now.