If they had the slightest potential to become a problem in the future, then they would have to be purged.
It was especially the case when it was done by those who did not know how to differentiate between a Spirit and an Evil Spirit too well.
They would have to make that kind of decision to avoid leaving behind a danger that could end up becoming the downfall of such a place.
Missing a single Evil Spirit due to failing to recognise what it had been could be disastrous in many ways.
They would likely be the ones to be blamed should anything go wrong, as they would have failed to do their job thoroughly.
It would be how a doctor would likely be blamed for failing to notice the symptoms in a patient and had let them go home, only for that person to die or end up being a carrier for something that could be both fatal and could be spread to others.
The reputation of the Balancers was on the line when they dealt with such things.
