The monarch in a society represents the will of the people to 'progress' and survive. I understand why the king can't make his own official move to 'disenfranchize' a noble (this is how civil wars start), especially one who contributes a lot to the country; that is just politics at work, and he is just looking after the greater good of the people, and he is right to say that 'ideals alone does not make a king' and in general, 'ideals alone will bring a country to ruin', which happened to a lot of nations in our world. Grey areas are always where everyone will need to work on. But of course, like what Loran is facing now, there are issues as corrupt as this, that it actually is detrimental and will hinder growth of even more of society.
This is why throughout history, there is always the 'asymmetric diplomacy' approach, which was arguably where a certain faction once called the 'Hashashin' exemplified in and actually had a hand in steering history in ways documented or unseen. It is not just about 'eliminating someone', it's more like changing something out of view of the eyes of politics, making things look like they happened natural, like a change of heart/mind, without any messy political discourse or full-scale wars.