T. H. Mercer

Service Guarantees Contact

Everyone argues about Starship Troopers. They’ve been arguing about it since 1959. The left calls it fascist; the right calls it aspirational. Both sides accept Robert Heinlein’s premise without questioning it: that mandatory federal service, as a prerequisite for the franchise, works because it screens for civic virtue. The Federation’s citizens earn the vote by demonstrating that they value the group above themselves. Sacrifice reveals character. Service proves worthiness.

It’s a compelling framework. It’s also wrong about the mechanism.

The Reframe

Heinlein’s Mr. Dubois lectures his students that previous democracies collapsed because voters had no skin in the game. Universal suffrage without sacrifice produced electorates that voted for comfort over survival. The Federation’s solution: make the franchise expensive enough that only the committed bother to earn it. The implied logic is selection. Service filters out the unserious.

But Gordon Allport’s contact hypothesis, the most replicated finding in social psychology, suggests something different is happening in Heinlein’s Federation. Allport found that intergroup contact reliably reduces prejudice when it occurs under conditions of equal status, shared goals, and institutional support. Military service under compulsion satisfies all three simultaneously. You cannot maintain tribal contempt for someone whose competence keeps you alive. It’s a claim about network topology, not character.

Service doesn’t test whether you’re worthy. It changes who you are. Not ideologically; no one converts to some centrist consensus. But people who serve alongside people they would never have chosen stop sorting the world into tribe and enemy.

The Evidence

Countries that maintain compulsory service should show lower tribal polarization than those that abandon it, and the effect should track contact specifically rather than some broader civic-duty signal.

Chagai Weiss, in a study later presented at Stanford’s Freeman Spogli Institute, tested exactly this across fifteen European countries. He found that compulsory military service measurably reduces affective polarization by preventing early partisan sorting: conscription interrupts the process by which young people increasingly live, work, and socialize only among ideological peers during the years when identity is still forming. Men exempt from service showed significantly higher affective polarization than those who served, even after controlling for ideology. A separate Erasmus University study found that conscription exposure reduced susceptibility to extreme right-wing populism, not through ideological conversion, but through reduction of group parochialism.

The American timeline is suggestive. The draft ended in 1973. The partisan sorting curve begins accelerating in the late 1970s. European countries that abolished conscription in the 1990s and 2000s show polarization increases on roughly a fifteen-to-twenty-year delay, consistent with a generational cohort aging through without the contact experience. Countries that maintained universal service; Norway, Switzerland, Finland, South Korea; show notably more durable national cohesion under stress.

Other forces were at work in the same period: cable news, geographic sorting, the Southern Strategy’s long aftermath. But the pattern is specific enough, and the mechanism clean enough, to deserve more weight than it receives. The standard accounts of polarization describe the sorting. Contact theory explains the conditions under which sorting becomes possible.

Why It Doesn’t Happen

If compulsory service reduces polarization through contact, the obvious question is why no one restores it. The answer is structural.

Reduced tribal sorting is a collective good. It makes democracy more functional, propaganda less effective, and the electorate harder to manipulate through identity mobilization. It is also, for that exact reason, a threat to virtually everyone who currently holds political power. Safe legislative seats depend on maximum sorting. The propaganda ecosystem, from cable news to social media outrage cycles, monetizes tribal fear. The donor class has never wanted its children sharing barracks with the working class, which is why Vietnam-era exemptions existed and why libertarian institutions like Cato oppose compulsory service with such consistency. Identity mobilization is not exclusively a Republican tool; both parties depend on a sorted electorate.

This is Mancur Olson’s Logic of Collective Action operating as predicted: concentrated minority interests will systematically outcompete diffuse majority interests because the minority has higher per-capita stakes and the majority faces a free-rider problem. Representative Charles Rangel introduced the Universal National Service Act five separate times between 2003 and 2013. It never received a serious floor vote. A 2025 Carnegie Corporation summit convened former Defense Secretary Lloyd Austin and Republican Governor Spencer Cox to push national service from aspiration to policy. It generated coverage and no legislation. The pattern holds: bipartisan support in polling, bipartisan co-sponsorship in committee, bipartisan death on the floor.

The intervention that would repair the system is blocked precisely because it would work.

Back to Heinlein

Heinlein built a fictional society where service produced functional democracy and attributed the result to moral virtue. The science suggests he was right about the outcome and wrong about the cause. The service requirement manufactures, at scale, the cross-cutting relationships that make tribal manipulation structurally ineffective. You can’t dehumanize someone you’ve depended on for survival.

We had an institution that did this, imperfectly and inequitably, for decades. We eliminated it in 1973 and replaced it with nothing. The polarization curve that followed is not mysterious if you take the contact mechanism seriously. Neither is the fact that no one in a position to restore it has sufficient incentive to try.

Heinlein’s question was whether citizens should earn the franchise through service. The better question: can a democracy survive without forcing its citizens to know each other?

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