This story is an empathetic one. And it's supposed to be based on reality. Noctis doesn't ask about the things that are going on around him because to him, what he needs to do is obvious -- obtain the crystal, reclaim his throne. He was born and molded for this. His friends were raised and molded for this.
The difference between XV's narrative and the usual FF tropes (thing happening, twist happens, a godlike being is somehow involved, kill godlike being, happily ever after) is that not only is it setup in a more realistic fashion, it gives you more realistic results considering what is pulling the strings. The gods are either directly or indirectly responsible for Starscourge, nobody knows right now, but what's clear is that they are directly responsible for Ardyn and how everything surrounding him went down. Ardyn is thousands of years old, immortal, and has the power of both the daemons and the crystal on his side. If he wanted, he could have taken the world over anytime he wanted to.
Both Ardyn and Noctis / Lucis kings were all set on their path by the Six before anyone had a chance to say anything about it. Noctis follows his path without complaining or deviating because it's the only path that's avaliable to him. Noctis actually had the chance to walk away from Ardyn after killing him, but that isn't the ending that he or anyone else would have wanted. Noctis, Luna, and Ardyn all got fucked by their circumstances, of which there was no viable way out that wouldn't have ended in annihilation of everyone on the planet. But the conflict is setup in a way where, in some bittersweet fashion, everyone still ultimately gets what they want. (Which probably is why Luna's tunnelvision for her duty as Oracle was emphasized in her character so much, as well as Noctis' childlike desire to just want to be with Luna over pretty much everything else.)
I'm sure it would have been neat for Noctis to pull some shit out of his ass and try to kill Bahamut and the other 5...but that just isn't how things happen in real life. In real life, you're given a set of cards, and those are the cards you play. Some hands you can work with...some you can't.