@givemersspls

I agree with your points, but I think the author isn't trying to advance this kind of argument seriously. It's been put in the mouth of an antagonist, after all. And to be perfectly fair, she was turning Yuzuru's "I did what's right" argument against him. My take on that is that even if he's pursuing "right", he has to be consistent: if, as you pointed out, Tasuku was right in the landfill episode, then Yuzuru cannot claim the same thing here. He has to decide. If he was unable to talk back to Chihiro this time, it's because he has thrown "right" to the dogs back then. If he hadn't, he could have insisted on there being a decidable standard of right when Chihiro confronted him in this chapter. I don't think the chapter sounds stupid if we look at things that way.

Of course, if we assume that Yuzuru's accepting her arguments and apologising is proof that her point is what the author is trying to advance, then I agree it's muddled thinking to say the least. But I think it is true that this manga is about the protagonist finding tangible motives for his actions, and confronting this kind of decision is part of it.

As for the repetition of "Execution", I think it's just a touch of absurdism. I read that in my mind with the voices of the piglets screaming for his blood in the courthouse.

@givemersspls
I agree with all your points
But this is a shonen manga
The author just want to create tension and survival conditions but sure it is ridicuolous

I disliked the philosophy of this chapter specifically. On the actual philosophy, this is about how right and wrong are used to justify horrible things like going to war and such. That's stupid. Yes, it's true. It's still stupid to give that as a reason for discarding right and wrong. Some of the worst attrocities in history were not predicated on right and wrong but instead based on nothing at all. I remember reading stories of Japanese atrocities where two soldiers competed to see who could kill 100 civilians with a sword first. When they got to a point, they realized they lost count, laughed, and then decided to just slaughter more civilians. That illustrates how it's not necessarily an issue of right and wrong that can lead to horrible things.

It also fundamentally speaks to how nonsensical their conversation is in this chapter. How do you decide what is horrible? How do you decide what is good or bad? You necessarily need a metric of right and wrong. This is the kind of thing that makes people think exestentialism is bullshit. This was just bad philosophy.

Separately, my gosh, the MC is stupid as all hell. Ask what constitutes a crime. Does he ever do that? Nope. That's why he gets surprised by the possibility of killing ants. So ants count but not any microbes living inside him that die in his stomach acid?

Then the whole repetition of execution just looked childishly nonsensical. Execution! Saying it so much was just silly at best and stupid looking at worst.