“At every step we are met by arguments which go to excuse, to palliate, to confound right and wrong, and reduce the just man to the level of the reprobate.”
The Study of History (1895)
Context: Most of this, I suppose, is undisputed, and calls for no enlargement. But the weight of opinion is against me when I exhort you never to debase the moral currency or to lower the standard of rectitude, but to try others by the final maxim that governs your own lives, and to suffer no man and no cause to escape the undying penalty which history has the power to inflict on wrong. The plea in extenuation of guilt and mitigation of punishment is perpetual. At every step we are met by arguments which go to excuse, to palliate, to confound right and wrong, and reduce the just man to the level of the reprobate. The men who plot to baffle and resist us are, first of all, those who made history what it has become. They set up the principle that only a foolish Conservative judges the present time with the ideas of the past; that only a foolish Liberal judges the past with the ideas of the present.
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John Dalberg-Acton, 1st Baron Acton 112
British politician and historian 1834–1902Related quotes

1880s, Plea for Free Speech in Boston (1880)

“The God excuse, the last refuge of a man with no answers and no argument.”

“All right and wrong, confounded in impious madness, turned from us the righteous will of the gods.”
Omnia fanda nefanda malo permixta furore
iustificam nobis mentem avertere deorum.
LXIV
Carmina

On C-SPAN3, American History TV, quoted in The Republic https://www.azcentral.com/story/opinion/op-ed/ej-montini/2017/10/22/john-mccain-mocks-donald-trumps-deferment-bone-spurs-without-naming-him/789051001/ (October 2017)
2010s, 2017

1960s, The American Promise (1965)

“Two wrongs don't make a right, but they make a good excuse.”
Source: The Second Sin (1973), P. 49.

“Every man has a right to his own opinion, but no man has a right to be wrong in his facts.”
Deming Headlight (New Mexico), 6 January 1950, as cited in the Yale Book of Modern Proverbs and at There Are Opinions, And Then There Are Facts; Freakonomics blog post by Fred R. Shapiro http://www.freakonomics.com/2011/08/18/there-are-opinions-and-then-there-are-facts/ (18 August 2011)

Alfred-Maurice de Zayas 2013 Report of the Independent Expert on the promotion of a democratic and equitable international order
2013

“And a step backward, after making a wrong turn, is a step in the right direction.”
Source: Player Piano (1952), Chapter 32 (p. 295)