Why do nations fight when the costs are so high? As battles continue in Ukraine and Gaza, and as tensions with Iran flare, the question feels urgent. A growing body of research points to recurring incentives that pull leaders into conflict. Political scientist Chris Blattman calls them the five factors that lead to war, and they help explain why peace so often slips away.
The Five Factors At A Glance
- Unchecked leaders who face weak domestic constraints.
- Uncertainty and bad information about rivals’ strength or intent.
- Commitment problems that make deals hard to trust or enforce.
- Indivisible stakes, like sacred sites or borders seen as nonnegotiable.
- Intangible incentives, including pride, status, or ideology.
If war is so costly, why do we keep fighting them?
That question frames the current debate. It also guides how observers assess off-ramps and risks in today’s conflicts.
Unchecked Leaders And Domestic Politics
Wars often start when leaders are insulated from costs. Autocrats face fewer electoral checks. Elites may gain from patronage, sanctions-proof profits, or rally-around-the-flag effects. When insiders benefit, the price paid by soldiers and civilians carries less weight in top decisions.
Ukraine shows how domestic politics can diverge. Russia’s leadership balances elite interests and state control of media. Ukraine’s leaders, by contrast, respond to voters and a large civil society. These different incentives shape bargaining positions and the willingness to accept compromise.
Uncertainty And Bad Information
Miscalculation is a common trigger. Rivals often misjudge each other’s resolve or military capacity. Intelligence is noisy. Signals get lost or spun for home audiences. When both sides expect quick gains, they choose to fight rather than settle.
The opening months of the Ukraine invasion reflected this problem. Many analysts believe the Kremlin expected a short campaign. Ukraine and its partners then adjusted, raising the costs and length of the war. In the Middle East, states and nonstate groups also signal under risk. Ambiguity can spiral into strikes and retaliation.
Commitment Problems And Security Dilemmas
Some disputes resist settlement because neither side can trust the other to keep a deal. Arms limits, border guarantees, or safe zones can fail without credible enforcement. If one side is growing stronger, the other may strike now rather than accept a worse deal later.
Security dilemmas magnify this risk. Defense moves look offensive to an adversary. Missiles and militias add layers of doubt. In the Gulf and Levant, rival networks and proxy groups complicate any pledge. Even well-designed agreements need monitors, timelines, and clear penalties to hold.
Indivisible Stakes And Ideology
Some issues feel impossible to split. Holy sites, occupied land, or questions of statehood often sit in this category. Leaders who concede may face backlash at home. Rival histories and national stories harden public opinion.
In Gaza and across Israel and the Palestinian territories, claims to land and security are tied to identity. When groups see compromise as betrayal, fighting becomes more likely and longer.
Intangible Incentives: Pride, Status, And Fear
Honor, deterrence, and the need to show strength can push leaders into risk. Leaders may fear that restraint invites more attacks. Publics also punish leaders who look weak. These pressures weigh heavily during crises.
Iran and Israel have traded strikes and covert actions over the years. Each step carries a signaling purpose. Deterrence is a message, but it can also lock rivals into cycles of action and reaction.
Applying The Lens: Iran, Ukraine, Gaza
The five-factor lens does not excuse violence. It helps map incentives and pressure points. In Ukraine, uncertainty and commitment problems dominate. European security guarantees and aid influence both. As long as credible enforcement is scarce, settlement is hard.
In Gaza, indivisible stakes and ideology shape choices. Civilian protection, hostage deals, and aid access depend on mechanisms that both sides view as credible. Regional actors try to broker steps that reduce fear and build verification.
With Iran and its partners, the mix includes status, deterrence, and proxies. Quiet backchannels can lower the risk of misread signals. Clear red lines, paired with off-ramps, reduce accidents.
Paths To Peace: What Works
Research suggests several tools help break cycles:
- Checks on leaders through domestic institutions and independent media.
- Third-party monitoring and phased deals that build trust in steps.
- Security guarantees that are credible, limited, and tied to behavior.
- Side payments or swaps that soften indivisible claims.
- Regular communication channels to cut misread signals.
These measures are not quick fixes. They reduce the odds of miscalculation and make bargains stick. They also align the costs leaders face with the costs borne by citizens.
The core insight is simple. War happens when bargaining fails for predictable reasons. In Ukraine, Gaza, and the Iran-Israel rivalry, those reasons are visible. The next phase will test whether regional and global actors can build enforcement, reduce uncertainty, and chip away at indivisible claims. Watch for credible monitors, phased timetables, and domestic reforms. These signals hint at whether peace is getting closer or further away.
