Quote Originally Posted by shinta|hikari View Post
But if the soldiers decide to not do it, they will be killed for not following orders. Even if they wanted to commit genocide, a moral person wouldn't just pre-emptively (or even retaliatorily) murder them all. There are other methods available to someone as powerful as Rimuru, such as convincing them to stop through a show of power (blow up a mountain) or assassinating their leaders to minimize loss of life.

The key thing here is Rimuru didn't care about doing the right and moral thing. He just wanted to resurrect his people (which I cannot fault him for). Sacrificing thousands of lives (that can be redeemed, people change) to revive a few of his friends and comrades is NOT moral and not something a just person would or should do. It is definitely understandable, but it is not morally justifiable in most human paradigms.
This isn't about avoiding a fight at a hot dog stand, after a football game. Those mediaval countries are like today's Russia: the only language they understand is (military) power. If Rimuru had somehow (more or less) peacefully managed to convince them to leave, by a show of power or whatever, they might have left, but they would have also deemed Rimuru too weak-willed to actually use that power in practice against them. So, they would collect a coalition, to return with more armies, trusting that Rimuru would again hesitate long enough for the new, stronger armies to secure a victory against Jura.

Now the whole world knows that anyone planning to invade the Jura forest will face a catastrophe. Maybe they will believe it's Veldora, but since they also know Veldora is Rimuru's buddy, it doesn't really matter. They will, nonetheless, know from what happened to Falmuth's army that attacking Jura directly is suicidal, with absolutely no ambiguity about it.

Like I said, this isn't about being a hero or whatever. It's about being the leader of a nation in a dangerous world.