Presumably a paraphrase of "A peculiar virtue in wildlife ethics is that the hunter ordinarily has no gallery to applaud or disapprove of his conduct" or of "Hunting for sport is an improvement ..." above.
Unlikely to be by Leopold, who knew that ethics involves not only doing the right thing, but also determining the right thing in the face of competing desirable criteria.
Misattributed
“I'll do anything, legal and ethical and honest.”
The Apprentice
Source: David, Schaper, Corruption Trial To Start For Ex-Ill. Gov. Blagojevich, June 2, 2010, Morning Edition, National Public Radio, transcript, June 29, 2015 http://www.wbur.org/npr/127362076,
Help us to complete the source, original and additional information
Rod Blagojevich 5
Former Governor of Illinois 1956Related quotes
The Des Moines Register https://www.newspapers.com/image/296428181 (11 May 1990)
“My biggest problem with modernity may lie in the growing separation of the ethical and the legal”
Source: The Bed of Procrustes: Philosophical and Practical Aphorisms
Fini: un gay non puo' fare il maestro http://archiviostorico.corriere.it/1998/aprile/09/Fini_gay_non_puo_fare_co_0_9804094008.shtml, Il Corriere della Sera, 9 April 1998.
“I promise I'll do anything for you, especialy if it's easy.
Homer Simpson”
"I'd Do Anything for Love (but I Won't Do That)"
Bat out of Hell II: Back into Hell (1993)