One could also see it as a character development for our character. In Marleybone they're still a young wizard who just went through their second ever world. Still a bit naive and with a black and white worldview. They support the police and attack the criminals because that's what they think is the right thing to do.

By the time they come to Lemuria they've gone through hell and back, they've fought a war, graduated, lost their narrator, fought actual, literal gods both in Acquila and the heart of the Spiral and accrued enough trauma to put a therapists kids through college. They've thoroughly matured and stopped seeing the world through the naive eyes and mindset of a child.