Bruh, The main character seems to not use his head. This game is not eve complete. And I can already figure out that both Tribes are innocent. The fact that I can't voice that though dialogue infuriates. This feud is so stupid.
(Not hate to the game)

Keep in mind this is not a VN/rpg where the protagonist is supposed to be you, eyvind (your char) is his own person, despite the choices and some stat checks being influenced by you.

In Eyvinds Defense: Nobody of the Chieftains may listen to him. He did actually ask both chieftain about the proof at least.  

In Axel Defense: 1. Unlike Nauxus he never saw the Culprit. 2. The Lizards already invaded  Territory by establishing hidden outposts and declared war. Axel also knows that his Tribe is at a strategic disadvantage.  His Priority is to keep his Tribe safe and win this War or face extinction.