There are entire Game Theory textbooks dedicated to grappling with the question of when and how one engages in violence. Because broadly speaking, violence is bad. The destructive social forces inhibit socio-economic development, degrade global quality of life, propagate disease, and cause catastrophic shortfalls of critical goods and services.
Whether you're working at the micro-scale of domestic abuse or the macro-scale of the bombing of Hiroshima, you're talking about a gross net negative for everyone involved.
But if a detente is one-sided, or a violent actor is free to act uninhibited, there are huge immediate rewards for looting and pillaging your neighbors, pressing ganging people into forced labor, and seizing neighboring property at gunpoint. It works great for perpetrators who engage in violence unchecked. Its only a problem when the perpetrator runs into a countervailing force.
But then over the long term, the violence takes an increasing toll. People don't build in neighborhoods that they think will be bombed. They don't invest in communities that are fracturing and falling apart. They don't befriend people they feel they can't trust or work alongside people they're terrified of.
Go look at Yugoslavia before and after the wars of the 1990s. Huge unified economy capable of operating on par with France or Italy, only to be splintered by violence and reduced to a near-pre-industrial state for over a decade. Who won the Yugoslav Wars? Who benefited from Bosnians and Serbians and Albanians and Croats pounding their plowshares into swords and slaughtering one another?
People talk about a "Peace Dividend" and you can see it in any country that's avoided a protracted military conflict for a generation or more. You can't be a successful country if you're always trying to hold one another at gunpoint.
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The US is a successful country and has almost always been at war.
The areas of the US that are most successful are those most insulated from social conflict. Areas that are subjected to state violence through overpolicing or are left to flounder in the face of industrial abuse, mafia violence, or unchecked domestic violence do much worse. Comparing Ferguson, MO to neighboring St. Louis illustrates this dynamic. One neighborhood is alternately brutalized by the city police and left exposed to domestic crime, dragging its socio-economic state into the gutter. The other is judiciously policed and socially supported by state and private largess, resulting in a far healthier and happier population.
Britain at its peak was holding 10s of countries at gunpoint.
And those countries suffered immensely. Meanwhile, Britain itself endured pockets of chronic crime and substance abuse specifically in areas that hosted military bases and other enclaves. The country saw an explosion in wealth inequality during its economic peak with the new wealth almost entirely accruing to the aristocracy. Victorian England was a hellhole for the Dickensian proletariat.
China's a great example of the Peace Dividend in action. You get a generation or two of peace and the country explodes with riches - both physical infrastructure and flowering culture.
Then warlords start poaching the wealth of the nation and the country plunges down into poverty, famine, and epidemic, immolating decades of social process.
After the burn out, you get a peaceful renaissance, and the country flowers again like a forest after a wildfire.