guilty of transgression

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This strange, cruel, and almost unaccountable ingratitude in the captain, absolutely broke the poor doctor's heart; for ingratitude never so thoroughly pierces the human breast as when it proceeds from those in whose behalf we have been guilty of transgressions.
But a venerable mujahedeen--a veteran of Afghanistan--named Khadun objected that the dog was a devil sent by God to punish those guilty of transgression against His laws, so cleansing and strict adherence, not guns, was the proper course of action.
They suggest that -- given the volume of abuse allegations -- the low number of police officers found guilty of transgressions indicates that the authorities are not doing enough to tackle the problem.