The noir moral architecture
Neo-noir inherits and revises a specific moral architecture: the world is corrupt at its foundations, virtue is either naive or performative, and the cost of surviving in this world is some form of compromise with what it requires. This architecture is not nihilism — it does not say that nothing matters or that no one is better than anything else — but it is anti-idealism, insisting that the institutions and authorities that claim virtue are organized around interests that virtue does not serve. Building this architecture into your neo-noir requires grounding it in specific, contemporary forms of institutional corruption rather than in generic noir atmosphere: the specific way money moves through a particular system, the specific interests that a particular institution protects at the expense of others.