That's not mercy though, that sociability. "Mercy" suggests she's there to take away pain or lessen suffering, but that's not her job.
She's not just there for the merciful releases, we see her being there for accidental deaths where mercy wasn't remotely involved, a kid hit by a car, a woman killed by a bad power cable, a mother who fell while changing a lightbulb in her kids room.
Just because she's a generally nice person doesn't make her merciful.