its not a trick, so much as something god allows here and there in order to subvert normal karma. the same way that jesus died so christians can just take his name, other cultures in the past who have had contact with god were given the opportunity to cleanse sin through sacrifice because god understands that humans are more advanced than the basic rules of karma already. even the ancient hindus had myths of people who purposely suffered in order to gain spiritual power, the rules of karma thousands of years ago were already understood to be easy to exploit and gamify. covenants with god allow for special ways to to reduce sin, but also can require very strict rules to show repentance.
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