Why Does Katie Keep The Simulation Running?
Short Answer
Katie keeps the simulation running because Lily and Forest now exist inside it, and she treats their simulated experience as something that should not be destroyed.
Connected Story Threads
Katie becomes the surviving custodian of Devs after Forest dies.
The simulation gives Lily a continued subjective life after physical death.
Katie decision gives Forest the reunion he sought.
Keeping the simulation running raises whether simulated people can be shut down, saved, or governed.
Katie's choice to keep the world active creates the ethical problem.
Lily's continued experience tests whether simulated life counts as life.
Direct Answer
Katie keeps the simulation running because Lily and Forest now exist inside it, and she treats their simulated experience as something that should not be destroyed.
Evidence From The Series
After the crash, Katie preserves the world containing Lily, Forest, and Amaya, then contacts Senator Laine because keeping it alive requires power beyond Amaya.
Why It Matters
Her decision may be mercy, loyalty, scientific arrogance, or all three at once.
Related Characters, Places, and Concepts
More Questions About Katie Running The Simulation
Senator Laine is the government figure Katie contacts after the finale because Devs can no longer remain only Amaya's secret.
Katie asks Senator Laine for help because Devs has outgrown private control after Forest's death and now contains simulated lives.
Katie believes the Devs machine has enough authority that predicted events can be treated as already meaningful.
Katie is Devs lead scientist and Forest closest ally, later becoming the person who keeps the final simulation running.
Lily's simulated world is not the physical world, but the series treats it as morally real if consciousness inside it can experience life.
Devs does not conclusively prove simulated consciousness, but it treats Lily and Forest simulated experiences as morally serious.