US investigates leak of records showing billionaires pay little tax
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1. Corruption cannot include legal behavior in which every ("reasonable") human partakes. [Implied: because it is legal]
Therefore, 2. Ethical standards are encoded in law.
Therefore, 3. Ethical behavior is governed by law.
Therefore, 4. Voluntary actions not specifically compelled or disallowed by law have no ethics.
My point is that it is possible for something to be legal, common, sensible from a perspective of pure self-interest, and still wrong and worthy of reproach.
I understand your point that law and ethics are not same. My question is when, where, why, how and with whom do these supposedly distinct concepts originate in a world where conclusions are require incontrovertible proof and not mere belief or peddling thereof?
There will never be an objective consensus. You may only add your answers to a cacophony.
You might like to start here, for philosophers: https://plato.stanford.edu/entries/aristotle-ethics/
And here for priests: https://people.ucalgary.ca/~elsegal/TalmudMap/Mishnah/MMaim....
https://assets.cambridge.org/97805218/06558/frontmatter/9780...