> Before the encounter with the first Troll, the dumbfounded mythical character, Atreus, asks: “We’re going to fight that?!?” Kratos, the main character, answers: “We have no choice,” in a matter-of-fact, almost resigned way, as if shruggingly accepting the design conventions of the game itself.

I didn't see it like that. Atreus thinks he and his father are normal humans, even if he saw his father perform incredible feats of strength such as carrying a huge tree trunk. Atreus has no idea what his father is capable of, and he himself has been mostly sick and frail. The boy is scared. Nowhere does that scene read as "That looks humanoid, I don't think we should kill it". Draugrs are more humanoid and they've been killing some on the way. The troll is incredibly fierce and the largest opponent they faced until now. That's a completely natural reaction from the boy with no moral implications.

It's actually a little later in the game when they're assaulted by Reavers (actual living humans talking about eating them) that Atreus kills one in self defense and remains shocked by the experience. Kratos shows empathy and care when he comforts him and says "Close your heart to it". [1]

There's a deep thread about humanity and the right or need to kill in self defense in the game, and Atreus goes through a rebellious phase where he thinks godhood gives him the right to do anything. But the troll scene? That's reading too much into it.

1. https://youtu.be/_oOZG5-tqpA?si=w6-PyJXjTZ-qSv2q&t=4173