"He that sups on death but little will find it a bitter draught. Yet he that drinketh deep shall taste the sweetest nectar." Jagganoth, Kill Six Billion Demons
That's all you get with half-measures, the worst of both worlds. I think we're supposed to simply despair at the folly of men ruining things for everyone out of fear of greed, but it's also hard to not resent Thorfinn's naïveté.
Arnheid's Village needed to have the same journey as Thors and he did, but he thought it would work to skip to the end. No, they wouldn't have been warriors if they hadn't been killers first, killers who had the strength to have the luxury of choice, the privilege to not have to kill to survive.
He had the right idea to try to forbid swords to show his commitment, but he should have cast out Ivar at the second he proved he didn't believe in Vinland. He also should have understood then that people don't only follow leader out of conviction, but interest.
And even when that interest is nothing more than what we consider now basic human rights, Thorfinn was incapable to offer them an expectation of safety.
At the second they met the Lnu and understood the land was already claimed, they should have left if they were fully committed to renounce violence. Because where there's people, there's trouble.
TLDR: Yukimura seems to want to turn us into catholics and learn to turn the other cheek, but it only reaffirms for me that we need to break a bully's nose at the second he appears if we want to know peace. Not a second before but not a second too late.
I'm sad he lost his friend Einar, but it's very disappointing that Thorfinn doesn't see himself the point he keeps making, when he displays his strength only to choose kindness: you need to have and show your ability to commit violence to not have to ever commit violence. Else, that only makes him a dreamer and not a leader.