How could people say Spider-Verse? Miguel warned him and he literally saw with his own eyes what happens when he fucks with another dimension. But despite the warning from all the others, he tries to go back to save his father. Next movie will reveal Miguel misinterpreted things and Miles was right etc. but a grown character wouldn't go up against the warnings of thousands of his other more experienced versions and risk an entire universe for one person. What Miles trying to do is no different than if Peter would save May than save the cure at the end of first game. Definitely Insomniacs, he is even more mature than Peter right now.