Ethics is something people learn every time and it differs differently on each person based on how they where raised. The focus on "administering justice" has a guide on how to properly do so. Officers and other judicial officials do not go into the job doing what they think is correct, they do what the books, laws, and policies say.
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Unless extraterrestrial humans enter Earth or people leave to inhabit another planet, net global immigration and emigration are both zero. Thus, to reduce the rate of global population change, the number of births must be reduced or the number of deaths must be increased.