Thrasymachus (in Plato’s Republic): “justice is the advantage of the stronger,” i.e., might makes right.
Nietzsche (often read as): moralities are masks for power (“will to power”).
Below is a compact, non-theistic toolkit—objective and (inter)subjective routes—that shows why justice isn’t reducible to brute force and why “will to power” doesn’t debunk moral claims.
1) Clarify the target: descriptive vs. normative
Descriptive theses (“people with power set the rules” or “values emerge from power struggles”) don’t entail the normative conclusion that domination is right or justified. From “is” to “ought” is a logical gap.
Ask the critic to bridge that gap: Why should power confer reasons for others to comply beyond fear?
2) Internal critiques of “advantage of the stronger”
Error problem (from the dialogue itself): If justice = whatever rulers command, then when rulers err about their own advantage (which they do), justice would require subjects to do what disadvantages the stronger—contradicting the definition.
Authority vs. coercion: Coercion creates compliance, not legitimacy. To treat “might” as “right” confuses de facto control with normative authority—the standing to impose obligations others have reason to accept.
Stability and second-order advantage: Even for the strong, stable cooperation, credible commitment, and trusted institutions are instrumentally superior to predation. Durable power requires norms that others can accept as fair; otherwise coalitions of the “less strong,” sabotage, and exit strategies undermine rule.
Epistemic asymmetry: Power doesn’t confer epistemic reliability about what is good or just. If truth and justification track reasons and evidence, not muscle, then “might” is the wrong property to ground “right.”
3) Game-theoretic and evolutionary counters (non-theistic, partly objective)
In repeated interactions (iterated prisoner’s dilemma, public-goods problems), rule-like cooperation(reciprocity, reputation, sanctioning of defectors) typically beats exploitation on long horizons.
“Might makes right” is myopic: It can yield short-run gains but is Pareto-inferior long-run. Societies that entrench fair procedures, reliable promises, and impartial adjudication outperform predatory regimes in security, wealth, and innovation.
This yields a quasi-objective claim: given stable facts about human psychology and incentives, certain justice norms are instrumentally necessary for collective flourishing.
4) Constructivist routes to objectivity without God
Kantian universalization: A norm is justified if it can be willed universally without contradiction or treating persons merely as means. “Might makes right” fails: you cannot coherently will a principle that authorizes others to dominate you whenever they can.
Rawlsian device (veil of ignorance): Strip away knowledge of your position. You will select principles that protect each person’s basic liberties and ensure fair opportunity—because you might be weak. That delivers publicly justifiable standards not dependent on theology.
Contractualism (Scanlon): An act is wrong if it rests on principles that others could reasonably reject. Principles licensing domination are exactly those the dominated have the strongest generic reasons to reject. That’s intersubjective and action-guiding without religion.
5) Naturalistic realism about value
Needs and flourishing: Humans share relatively stable needs (bodily integrity, agency, social belonging, practical reason). Practices that reliably frustrate those needs are objectively bad for creatures like us.
Capabilities/perfectionism (Aristotelian line, secular): Political and moral norms are assessed by how well they enable the development of human powers (reasoning, affiliation, creativity) across persons. Domination predictably stunts these.
This is objective in a modest sense: given facts about human functioning, some arrangements are better or worsefor us as the kind of beings we are.
6) Re-reading Nietzsche without conceding domination
Nietzsche’s genealogies expose the origins and psychological payoffs of moral codes; they don’t deliver a normative proof that domination is justified.
On strong readings, “will to power” is about self-overcoming and the creative enhancement of life, not a license to subjugate others. A society that protects spaces for excellence, experimentation, and self-fashioning (without humiliation or cruelty) may actually satisfy that aspiration better than master-slave politics.
Nietzsche’s critique of ressentiment can be absorbed: it warns us against moralities that weaponize grievance. But a justice built on reciprocal recognition and excellence for all is neither herd morality nor priestly vengeance.
7) Subjective → intersubjective objectivity
Ideal observer theories: what fully informed, impartial, and coherent agents would endorse under favorable conditions.
Public-reason tests: A norm counts as justified if it survives transparent scrutiny among free and equal agents who must live under it. “Might makes right” fails these conditions—its only appeal is to those currently advantaged.
8) Common pushbacks & replies
“What if domination pays?” Sometimes locally. But (i) coalitions, exit, and resistance raise its cost; (ii) it corrodes information flows (people lie to tyrants), producing bad policy; (iii) it incites arms races and insecurity; (iv) it’s brittle—succession crises and palace intrigue are endemic.
“Psychopaths won’t care.” True outliers exist. Morality is for public regulation and mutual assurance among the rest of us; institutions (law, enforcement, transparency) are designed to handle outliers. Their existence doesn’t vindicate the principle of domination.
“All morality is constructed.” Grant construction; not all constructions are equal. Constructions that are (a) mutually justifiable, (b) stability-enhancing, and (c) supportive of generic human goods have stronger claimsthan those that aren’t.
9) A succinct secular case for justice
Normative authority ≠ coercive power.
Feasibility and stability favor cooperative rules that all can accept from a fair standpoint.
Human flourishing provides naturalistic standards to grade institutions.
Public justification (universalization, veil of ignorance, reasonable-rejectability) yields constraints that exclude domination.
Nietzsche’s best insights about vitality and self-overcoming are better realized under just institutions than under “might makes right.”
10) How to use this in debate (quick script)
Separate is/ought: “You’ve described how power works; why should that be our standard of right?”
Offer a fairness test: “Behind a veil of ignorance, would you endorse a rule that lets the strong dominate? If not, you concede it lacks public justification.”
Point to payoffs: “Societies that institutionalize fair cooperation are richer, safer, and more creative. Predation is short-term efficient, long-term ruinous.”
Reframe Nietzsche: “Channel ‘will to power’ into excellence and self-mastery, not domination—justice protects the conditions for that.” Bottom line: Without appealing to God or religion, you can defend justice as (i) the publicly justifiable terms of social cooperation among free and equal agents, (ii) the rules that stably maximize shared human flourishing for creatures like us, and (iii) the only norms that survive impartial tests we’d accept before we know whether we’ll be the strong or the weak. “Might makes right” fails all three.