A top U.S. Catholic bishop clarified the Church’s just war teaching on April 15 as political leaders publicly challenged the Pope’s peace calls during the U.S.-Israel war on Iran. Bishop James Massa of Brooklyn, who chairs the U.S. Conference of Catholic Bishops’ Committee on Doctrine, stressed that just war doctrine has never been a blank check for violence.
Traditional Just War Requirements
The Church requires several conditions before war can be justified. An aggressor must have caused grave, lasting, certain harm. All peaceful options including negotiations and diplomacy must have failed. There must be a real chance of success. The fighting cannot cause worse evils than the harm being stopped. Bishop Massa explained these criteria trace back to St. Augustine, St. Ambrose, and St. Thomas Aquinas, forming centuries of Catholic moral teaching on warfare.
The bishop emphasized the Church urges governments to exhaust every possible alternative before using military force. He noted the current conflict lacks a clearly stated endgame, which is essential for legitimacy in military engagement. A clear purpose and goal for war must be articulated, along with how peace will be achieved and what international relations will look like afterward.
Historical Context and Papal Warnings
Bishop Massa drew parallels to Pope Benedict XV during World War I, who pleaded desperately for cessation of fighting as baptized Catholics killed each other in massive slaughter. That pope advocated for the League of Nations before most world leaders recognized the need for international conflict resolution bodies. This set the pattern for subsequent popes through Pope Leo XIV today, who have consistently urged using international bodies to resolve conflicts rather than resorting to war.
Current Tensions with Administration
The statement came as President Donald Trump, Vice President JD Vance, and other administration officials publicly challenged Pope Leo XIV’s calls for peace. Bishop Massa defended the Pope’s role as guardian of conscience, noting Pope St. John Paul II apologized for historical violence committed by Catholics in the Church’s name. The bishop suggested that while some historians debate the legitimacy of the Crusades, the broader pattern shows the Church consistently advocating for peaceful resolution over military force in modern times.
