Hooo boy.
Yeah, while all you guys are all "FUCK YEAH! MC FOLLOWED THROUGH!", ya'll are forgetting that this country doesn't exist in a vacuum. There are other countries as well. And while none of them are as powerful?
Uh, yeah. This country just literally got decapitated. And in a way that the other, very important people (like the nobles who are responsible for defending their borders) are not gonna know about for a while. Granted, this also means that future invaders won't know until about the same time, but yeah, you get the idea.
Now.
I'm not saying this out of pity for the ruling class. I'm saying this because in settings like these? You deconstruct them even a little bit, and it becomes a charnel house of rape, murder, and pillaging.
I think the opening track for VNV Nation's album "Praise The Fallen" puts it best:
Orders shouted in a strange guttural tongue that resounded along the walls of the houses, which seemed dead and deserted while, behind the closed shutters, eyes watched the conquerors who, by right of war, were now masters of the city and of the lives and the fortunes of its people.
In their darkened ruins, the inhabitants have given way to the same feeling of panic which is aroused by natural cataclysms. Those devastating upheavals of the Earth, against which wisdom and strength alike are of no avail.
Though the same feeling is experienced wherever the established order of things is upset. When security ceases to exist, when all that was previously protected by the laws of man and nature is suddenly placed at the mercy of brutal, unreasoning force.
The earthquake, burying a whole people beneath the ruins of their houses. The river in spate, sweeping away the bodies of drowned peasants, together with the carcasses of cattle and rafters torn from roofs. And the victorious army slaughtering all who resist, making prisoners of the rest, looting by right of the sword, and thanking their god to the sound of cannon.
All these are terrifying scourges which undermine all our belief in eternal justice and all the trust we have been taught to place in divine protection and human reason.
That. Exactly. That is the fate that awaits the people of this kingdom, who had fuck-and-all to do with the MC's pain and suffering.
If this is what comes to pass, then the MC is gonna find that he's done far worse to far more people that these ass hole rulers did.
And then his class mates are going to be perfectly justified in coming after his stupid revenge-happy ass.
After all, why do you think that demon had such a big grin on his face? It was not just the innocents in that castle. It's because the MC just bought this world an entire fucking Amazon Hub packed to the rafters with nothing but pain and suffering, wholesale, and he's passing the savings on to everyone else.
EDIT: Oh, and BTW? Where do you think this country's treasury was at?
Did anyone see a bunch of money at the bottom of this crater?
No?
Yeah. Guess what? He just fucking disappeared all of this country's funds.
Nice job breaking it, hero.