Catholic teaching does not reduce “justice” to punishment or to slogans; it defines justice as a firm and constant will to give each person their due. 1 From that foundation, the Church affirms that societies must secure social justice (conditions so people can obtain what is “due”), 2 and that Catholics may defend rights with legitimate, licit means while preserving peace and the common good. 3 On that basis, the claim that justice “demands” diplomatic advocacy for political prisoners is largely consistent with Catholic principles—though the Church’s documents more directly ground defense of human rights and dialogue/negotiation than they give a blanket instruction about every case or every method. 4 5 6 7

Justice as giving “their due” (not merely emotions or charity)

In the Catechism, justice is explicitly defined: “Justice consists in the firm and constant will to give God and neighbor their due.” 1 This “due” language is crucial: it points to obligations grounded in truth about persons and rights, not only to benevolent assistance.

The Catechism also makes clear that when we help those in need, we are not only performing kindness but sometimes paying a debt of justice: “More than performing works of mercy, we are paying a debt of justice.” 8

Applied broadly, political prisoners are not just “objects” of policy. They are human persons whose basic rights must be respected. Since justice requires giving each person what is due, advocacy for prisoners’ legitimate treatment and legal standing fits Catholic justice—especially when the alleged wrongdoing involves violations of rights.

Social justice: society must provide conditions for people to obtain what is due

Catholic social teaching teaches that social justice is secured when society provides the conditions for individuals and associations to receive what they are owed: “Society ensures social justice by providing the conditions that allow associations and individuals to obtain their due.” 2

If people are unjustly detained, denied fair process, or treated in ways that violate human rights, then society is failing at the very task social justice describes. In that context, urging lawful correction—especially through channels that protect peace—can be understood as pressing society to restore what is due.

Human-rights advocacy and diplomacy: why “diplomatic advocacy” fits the Catholic logic

The Church’s diplomatic mission is not accidental to justice. For the Holy See, human-rights work is a particular commitment. Pope Paul VI states that the Holy See and its diplomacy have a special focus on “human rights.” 4

Pope John Paul II likewise treats diplomacy and negotiation as instruments connected to justice and the common good. He notes diplomacy as a “specialized means of trusting in the moral resources of peoples,” and he highlights advocacy for solutions acceptable to conflicting parties through patient dialogue. 9

That same theme appears in a homily on Cardinal Casaroli: effective diplomatic dialogue is described as “the high road and supreme method” for both peace and the effectiveness of diplomatic action; and authentic dialogue is “firm in asserting the truth and in defending the right, and respectful towards individuals.” 5

So, if the injustice involves rights violations connected to detentions, then Catholic principles provide a strong “why” for diplomatic advocacy: it is a way to defend rights and seek truthful, peaceable solutions.

What justice allows about political engagement: licit means, proportionality, and peace

Catholic teaching also clarifies how one may advocate politically.

Pope Pius XI gives concrete principles on political action: rights must be used in ways that are licit, proportionate, and that avoid harming the common good more than the action seeks to repair. 3 He adds a major boundary: “the clergy and Catholic Action… [must not] enter in any manner in the task of… violent defense,” even while acknowledging Catholics should prepare to use their rights “with all legitimate means according as the common good requires.” 3

This matters for interpreting the user’s claim. “Diplomatic advocacy” typically belongs to the category of nonviolent, rights-focused, truth-asserting action—precisely what these principles favor—rather than violent confrontation.

Nuance: the Church most directly commands defense of rights, not a single tactic for every prisoner

While Catholic teaching supports advocacy for human rights through lawful means, the sources given here do not provide a single formula like: “the Church demands diplomatic advocacy for every political prisoner in every situation.”

Instead, the sources give a framework:

• Justice requires giving people what is due. 1
• Society must provide conditions so individuals can obtain what is due. 2
• The Holy See has a particular commitment to human rights through diplomacy. 4
• Dialogue is a “high road” and must be firm in defending the right while remaining respectful. 5
• Political engagement must be licit, proportionate, and nonviolent; Catholics can defend rights with legitimate means, while clergy do not take up violent defense as such. 3

So the most accurate Catholic way to state the position is: because justice concerns persons’ due rights, and because the Holy See treats human-rights work as a rightful object of diplomacy, diplomatic advocacy is a strongly consonant means for seeking the release or humane treatment of political prisoners where rights violations are alleged.

Addressing “political prisoners” specifically under Catholic categories

Even without an explicit “political prisoners” phrase in these particular extracts, the Catholic concepts point clearly to the moral core:

1. Persons have rights rooted in their dignity—and the Holy See explicitly seeks international respect for the rights of individuals and peoples. 7
2. Violations of fundamental rights call for protest: Pius XII condemns methods that “violate the principal rights of the human person” and calls for Christians not to refrain “from raising their voices… in real horror” and uttering protest. 10
3. Legitimate advocacy should aim at restoring justice without escalating harm: it must use means proportionate to the end and not cause “greater damages than those they seek to repair.” 3

Given these, “advocacy for political prisoners” can be presented as pressing for restoration of justice: fair legal processes, protection against rights violations, and humane treatment—using approaches that defend truth and rights while seeking peace.

Conclusion

Catholic teaching grounds justice in giving persons what is due, tied to dignity and social justice. 1 2 The Church also explicitly frames the Holy See’s diplomacy as committed to human rights, and it praises dialogue as firm in defending the right while remaining respectful. 4 5 With the Church’s principles about licit, proportional, nonviolent political action and limits on violent defense, diplomatic advocacy emerges as a particularly compatible expression of justice when prisoners’ rights are violated. 3 The claim is therefore broadly true in principle, provided it is understood as human-rights defense through lawful, peaceable diplomatic channels, not as an unlimited mandate for any single tactic in every circumstance. 3 10 7