“Where slavery exists, the republican theory becomes still more fallacious.”

Source: Labour Defended against the Claims of Capital (1825), p. 22

2000s, The Real Abraham Lincoln: A Debate (2002), The Right of Secession Is Not the Right of Revolution

"The Dirty Trickster" (2008)

Source: The God of Jane: A Psychic Manifesto (1981), p. 58
Context: When we believe that science or religion "has the truth," we stop our speculations. While still referring to the theory of evolution, science accepts it as a fact, about existence, and therefore any speculation that threatens that theory becomes almost heretical. So often it seems that there is no other choice in the matter of man's origin than a meaningless universe and an earth populated by creatures who fight for survival, or a universe created by Christianity's objectified God. And to me, at least, the Eastern religions present no acceptable answers, either.

"Introductory Lecture on the Harmony of Theory and Practice in Mechanics" (1856), p. 4

to Edwin L. James of the New York Times (1928)
1920s

Source: Dream of the Red Chamber (1958), p. 7

Speech https://diplomatdc.wordpress.com/2010/06/05/the-libertarian-attack-on-abraham-lincoln-by-gregory-hilton/ (1859) <br class="br">1850s

Also in Fallen Angels (Baen Books, 1992) as: "Niven's Law: No cause is so noble that it won't attract fuggheads."
Niven's Laws
Context: 16) There is no cause so right that one cannot find a fool following it.
To prove a point, one may seek out a foolish Socialist, thirteenth century Liberal, Scientologist, High Frontier advocate, Mensa member, science fiction fan, Jim Bakker acolyte, Christian, witch, or fanatical devotee of Special Interest Lib. It doesn't really reflect on the cause itself. Ad hominem argument saves time, but it's still a fallacy.