What causes the change in Randy behavior in alas Babylon?

In "Alas, Babylon," Randy Bragg's behavior transforms from a carefree, somewhat irresponsible young man to a more responsible and resourceful leader following a nuclear disaster. The dire circumstances force him to confront his values and take charge of his community's survival. His growth is catalyzed by the need to protect loved ones and adapt to a new reality, showcasing his emerging maturity and resilience in the face of crisis.