“Ad hominem argument saves time, but it's still a fallacy.”

— Larry Niven

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.

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Larry Niven138

American writer 1938

Sir John Bayley, 1st Baronet (1763–1841) British judge

1 St. Tr. (N. S.) 282.
Trial of Hunt and others (King v. Hunt) (1820)

“The cure for a fallacious argument is a better argument, not the suppression of ideas.”

Carl Sagan (1934–1996) American astrophysicist, cosmologist, author and science educator

“Happily I had very early learned the fallacy of building much on logic and verbal argument.”

James Anthony Froude book The Nemesis of Faith

Confessions Of A Sceptic
The Nemesis of Faith (1849)
Context: Happily I had very early learned the fallacy of building much on logic and verbal argument. Single sets of truths I knew to be as little conclusive in theology as in physics; and, in one as in the other, no theory to be worth anything, however plausibly backed up with Scripture texts or facts, which was not gathered bona fide from the analysis of all the attainable phenomena, and verified wherever possible by experiment.
"Here is a theory of the world which you bring for my acceptance: well, there is the world; try — will the key fit? can you read the language into sense by it?" was the only method; and so I was led always to look at broad results, at pages and chapters, rather than at single words and sentences, where for a few lines a false key may serve to make a meaning. So of these broad observations I only expected a broad solution.

“The weapon of criticism obviously cannot replace the criticism of weapons. Material force can only be overthrown by material force, but theory itself becomes a material force when it has gripped the masses. Theory is capable of gripping the masses when it demonstrates ad hominem, and it demonstrates ad hominem, when it becomes radical. To be radical is to grasp things by the root, but for man the root is man himself. The clear proof of the radicalism of German theory, and hence of its political energy, is that it proceeds from the decisive positive abolition of religion.”

Karl Marx (1818–1883) German philosopher, economist, sociologist, journalist and revolutionary socialist

Contribution to the Critique of Hegel's Philosophy of Right (1843)

“The central message is still that, as Keynes argued, fiscal policy is the answer to liquidity traps, financial or political. The arguments against fiscal policy in Japan, so far as I understand them are intellectually fallacious; they would receive failing grades in an undergraduate macro exam.”

James Tobin (1918–2002) American economist

"Reflections on Japanese Political Economy" (1999)

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

James Madison (1751–1836) 4th president of the United States (1809 to 1817)

Vices of the Political System of the United States http://press-pubs.uchicago.edu/founders/documents/a4_4s2.html (April 1787), Papers 9:350-51 <br class="br">1780s