This reminds me of that meme of the guy riding the bike and he makes himself fall and then blames something. This guy is apparently on a quest to save his own homeworld from the Colossi, and his waifu calls him and says you should ally with the other people who are also fighting the Colossi, humans. And he's like "No...they're the enemy". lmao. He invaded and made the war happen. If he had just shown up and said we should kill Colossi together then that's probably exactly what we would have done.

But if everyone works together and acts logically, then half of all stories wouldn't exist, so it is what it is.