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"Might makes right."
the "law of the strongest" describes a natural process, not a moral norm. Using it as a justification is social Darwinism, which once served to justify inequality and violence among humans and was rejected. The whole idea of rights exists precisely to protect the weakest from the force of the strongest.
Short answer
The "law of the strongest" describes what happens in nature, not what is right. Using it as a moral rule is social Darwinism, which once justified slavery and the exclusion of people, and was rejected for that reason. The whole idea of rights exists to protect the weak from the strong. If strength gave rights, anyone stronger than you could do whatever they wanted with you.
For children
At school, can the biggest kid in class push the smaller ones around? No, and that's exactly why there are rules: to protect those who are smaller or weaker. Being strong doesn't give the right to hurt. It's the same with animals: being stronger than them doesn't give people the right to hurt them.
"If strength gave the right, could someone stronger than you use you?"
Como pode aparecer
"Survival of the fittest."
"It's the law of the jungle."
"The weak serve the strong."
"If they were stronger, they'd eat us."
"Do you think a tiger would feel sorry for you?"
"Natural selection favors those who dominate."
"We're at the top of the food chain." (which is C4)
The strongest version
"Survival of the fittest. It's the law of the jungle. The weak serve the strong."
Strongest version (steelman):
- P1In nature, the strongest or fittest prevail over others.
- P2Humans are, in practice, the most powerful species on the planet.
- P3It's natural for the most powerful to use the weaker.
- CSo it's legitimate for humans to use other animals.
The strong version rests on a reading of the theory of evolution. But Darwin described how species change, not how we should act.
The argument is valid. Its soundness fails at P3, which turns a natural process into a norm, and in the idea of force as legitimacy.
Full answer
- a
Reconstruction and diagnosis
The argument uses evolution as if it were a moral rule:
What the theory of evolution describes What the argument concludes Better-adapted organisms tend to leave more offspring The strongest have the right to use the weakest A process with no intention or value A rule of conduct - b
Where the argument breaks
1. It's the move from "is" to "ought".
Something happening in nature doesn't say whether it's right (C1).
2. "Fittest" doesn't mean "strongest".
In biology, fitness is success in leaving offspring, and it often depends on cooperation, not strength. The phrase "survival of the fittest" isn't even Darwin's: it was coined by Herbert Spencer.
3. Social Darwinism has already been tried.
The idea that the law of the strongest applies to society was used to justify slavery, colonialism and the exclusion of the poor. Thomas Huxley, Darwin's defender, argued in 1893 that ethical progress consists precisely in combating the natural process, not imitating it.
4. Rights exist against force.
Laws, rights and institutions serve to stop the most powerful from doing what they want with the most vulnerable. Accepting the law of the strongest would abolish the very idea of justice.
5. The argument turns against whoever uses it.
If strength gave rights, any stronger person or group could use whoever defends the argument.
- c
Data and sources
Source What it says Note Huxley, *Evolution and Ethics* (1893) Society's ethical progress depends on combating the cosmic process, not imitating it Romanes Lecture; full text on Project Gutenberg Britannica, *survival of the fittest* The phrase was coined by Herbert Spencer in Principles of Biology (1864) and adopted by Darwin in the fifth edition of On the Origin of Species Encyclopedia Caviola, Everett and Faber, 2019 Speciesism correlates with social dominance orientation Shows the link between speciesism and a preference for hierarchy - d
The strongest counter-reply: it's not a right, it's reality
The most serious version says this isn't about justifying but about recognizing reality: there have always been, and always will be, those who dominate, and morality is a luxury of those already on top. Demanding that humans give up their power over animals would be naive.
- e
Why the counter-reply doesn't reach the conclusion
Describing isn't justifying.
Even if domination is common, the moral question remains.
History refutes the fatalism.
Many forms of domination were abolished or reduced, against those who said they were inevitable.
The argument abandons ethics.
If morality is a luxury, there's no moral debate left, only power.
Reasoning errors
Logical
Is the form valid?
Hume's law (from is to ought)
Equivocation
Epistemological
Does the evidence support it?
Misreading evolution
Moral
Is the criterion coherent?
Power as legitimacy
Biases
Social dominance orientation
A preference for hierarchies makes strength a justification
Extrapolations
The principle being tested is: "the strongest have the right to use the weakest".
If it applied to…ChildrenTap to see
Adults could use them as they pleased
No one accepts this
If it applied to…Peoples with less military powerTap to see
They could be dominated
It's the logic of colonialism
If it applied to…Whoever defends the argumentTap to see
They could be used by someone stronger
The principle turns against its user
Contradictions
No one accepts being used by someone stronger.
They exist to restrain the law of the strongest.
Children, the elderly and the sick are protected precisely because they're vulnerable.
What the argument gets right
What is true
The description holds some truth: nature is full of competition, and humans have enormous power over other species. Pretending that asymmetry doesn't exist would be naive.
But
But recognizing strength isn't accepting it as a rule. Human moral history is, in large part, the history of limiting what the strong can do to the weak. Extending that history to animals continues it; it doesn't deny nature.
Connections
Usually comes before
Usually comes after
Go deeper in Questão de Ética
Chapters from the open-access collection A Journey Through Animal Ethics that discuss this argument in more detail:
- If Speciesism Is Natural, Is Speciesism Justified? Vol. I, ch. 8
References
Philosophy and history of science
- *Evolution and Ethics*.
- Principles of Biology.
- Britannica. Survival of the fittest.