The problem isn't about intelligence, but maturity. Japanese games are mostly aimed at early teenagers. With most of us in this forum hovering around 30 years of age, we can't help it but feel those games are 'teenage dramas'.
Western games aren't any better. They also target early teenagers while pretending to be more mature (read that as gritty and dark).
Lastly, it's not because someone is intelligent that they can discover something. Equipment, material, funds and the will to explore are important. One of the smartest man on the planet is a Hollywood actor. I don't think he cares much about quantum physics.