The world seems to be falling apart.
Only lunatics from North Korea or Iran once mumbled about using nuclear weapons against their supposed enemies. Now Vladimir Putin, after gobbling up the Crimea, points to his nuclear arsenal and warns the West not to "mess" with Russia.
The Middle East terrorist group the Islamic State keeps beheading its captives and threatening the West. Meanwhile Obama admits to the world that we "don't have a strategy yet" for dealing with such barbaric terrorists. Not long ago he compared them to "jayvees."
Egypt is bombing Libya, which America once bombed and then left. Vice President Joe Biden once boasted that a quiet Iraq without U.S. troops could be "one of the great achievements" of the administration. Not now.
China and Japan seem stuck in a 1930s time warp as they once again squabble over disputed territory. Why all the sudden wars?
Conflicts rarely break out over needed scarce land -- what Adolf Hitler once called "living space" or even over natural resources. A vast, naturally rich Russia is under-populated and poorly run. It hardly needs more of the Crimea and Ukraine to screw up. The islands that Japan and China haggle over are mostly worthless real estate. Iran has enough oil and natural gas to meets it domestic and export needs without going to war over building a nuclear bomb.
Often states fight about prestigious symbols that their own fears and sense of honor have inflated into existential issues. Hamas could turn its back on Israel and turn Gaza into Singapore -- but not without feeling that it had backed down.
Putin thinks that grabbing more of the old Soviet Republics will bring him the sort of prestige that his hero Stalin once enjoyed. ISIS wants to return to 7th century Islam when the Muslim world had more power and honor.
The great Argentine writer Jorge Luis Borges once summed up the Falklands War between his country and Britain as a fight "between two bald men over a comb." In fact, Britain went to war over distant windswept rocks to uphold the hallowed tradition of the British Navy and the idea that British subjects everywhere were sacrosanct. The unpopular Argentine junta started a war to take down Britain a notch.
But disputes over honor or from fear do not always lead to war. Something else is needed -- an absence of deterrence. Most aggressors take stupid risks in starting wars only when they feel there is little likelihood they will be stopped. Hitler thought no one would care whether he gobbled up Poland, after he easily ingested Czechoslovakia and Austria.
Saddam Hussein went into Kuwait believing the U.S. did not intervene in border disputes among Arab countries. Deterrence, alliances and balances of power are not archaic concepts that "accidentally" triggered World War I, as we are sometime told. They are the age-old tools of advising the more bellicose parties to calm down and get a grip.
What ends wars?
Not the League of Nations or the United Nations. Unfortunately, war is a sort of cruel laboratory experiment whose bloodletting determines which party, in fact, was the stronger all along. Once that fact is again recognized, peace usually follows.
It took 50 million deaths to remind the appeased Axis that Germany, Italy and Japan in 1941 were all along far weaker than the Allies of Britain, the Soviet Union and the United States. The Falklands War ended when Argentines recognized that boasting about beating the British was not the same as beating the British.
Each time Hamas builds more tunnels and gets more rockets, it believes this time around it can beat Israel. Its wars end only when Hamas recognizes it can't.
War as a reminder of who is really strong and who weak is a savage way to run the world. Far better would be for peace-loving constitutional governments to remain strong. They should keep their defenses up, and warn Putin, ISIS, Iran, North Korea and others like them that all a stupid war would accomplish would be to remind such aggressors that they would lose so much for nothing.
Even nuclear powers need conventional deterrence. They or their interests are often attacked -- as in the case of Britain by Argentina, the U.S. by al-Qaida, or Israel by Hamas -- by non-nuclear states on the likely assumption that nuclear weapons will not be used -- and on the often erroneous assumption that the stronger power may not wish the trouble or have the ability to reply to the weaker.
If deterrence and military readiness seem such a wise investment, why do democracies so often find themselves ill-prepared and bullied by aggressors who then are emboldened to start wars?
It is hard for democratic voters to give up a bit of affluence in peace to ensure that they do not lose it all in war. It is even harder for sophisticated liberal thinkers to admit that after centuries of civilized life, we still have no better way of preventing Neanderthal wars than by reminding Neanderthals that we have the far bigger club -- and will use it if provoked.
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Victor Davis Hanson, a classicist and military historian, is a senior fellow at the Hoover Institution and a recipient of the 2007 National Humanities Medal.