Comment Another consideration (Score 1) 418
The Franco-Prussian war led to Paris being taken over by communards for two months in 1871.
World War I led to Russia being taken over by communists, in addition to other worrying developments for the powers that be (Hungary established a Soviet Republic until it was invaded and defeated, naval and Spartacus uprisings in Germany, Nivelle mutinies in France, Bienno rosso in the early 1920s in Italy).
World war II led to a communist bloc eastward "from Stettin in the Baltic to Trieste in the Adriatic" as Churchill put it. It also more-or-less led to China and North Korea becoming communist. People tend to forget communist influence among the working class in Western Europe - the PCF was the largest political party in France into the mid 1950s, and the PCI came close to winning elections in Italy into the mid 1970s, the "right" included an Italian Socialist Party with a hammer and sickle in its banner. And then of course the decolonization movements from everywhere from Cuba to Indochina to Northern Ireland to Algeria and the rest of Africa.
The feudal, and later capitalist, powers in Europe deciding to go to war with one another has always strengthened the left. Liberal opinion is now war-tired and so forth primarily due to this. As the above poster said, bombing the Serbs and the like did not creep into this supposed war-weariness. Yeltsin bombing his own parliament was hailed by liberals and social democrats, and of course the right, as a triumph of democracy.
The only wisdom that has been obtained by the ruling powers, is that Mario Monti and Lucas Papademos probably both realize that if they tried to set their countries to war against one another, their populations might take up the words of that old song and shoot the generals on their own side. The ruling powers realize war might possibly put their head on the chopping block, and that's the main reason they've become peaceniks, at least amongst other Europeans in the club.