This is a good show, but this episode is a bit unrealistic, imo. The premise, without giving anything specific away, is that a monarch has become compromised and is making a decision that is near-universally perceived as catastrophic for his kingdom (and everyone in it).
The heart of this premise is the question "what if a person with absolute authority over a group of people decides to do something that's nakedly self-serving to the detriment of everyone else?"
Some milder examples of this kind of selfish decision making are common, of course. You'd be hard pressed to find a corporate org chart where the upper levels of authority didn't live a much higher standard of living than those in the middle on down. So it's natural to ask, what would it look like if a leader demanded that everyone support a decision that would lead them into destruction, even if that destruction were completely avoidable by choosing instead an outcome the leader didn't want but which was more palatable to everyone else?
But actually we know these days that systems that seem to put absolute power in one person's hands, like the king in a monarchy, actually have a very complex network of hidden power structures. So a monarch doesn't really have absolute power; they are beholden to groups of powerful nobles who have to be kept happy to allow them remain in power. Even North Korea, one of the most extreme dictatorships in the world and one that actually deifies their leader, has these same types of hidden power networks of generals and the like that must be kept appeased to keep the leader in power.
And there are real world examples that match the situation depicted in this episode, in spirit at least. When Nero, a Roman emperor with theoretically unlimited authority and power, made decisions that damaged the wealth of the powerful senators, they simply killed him, his wife, and his children and moved on. So my suspicion is that the situation in this episode would involve a lot less stoicism and talk of inflexible duty and a lot more angry muttering and regicide.