But if you look at the history of wars, you can debate the proposition about no democracies ever going to war, but you can't debate the proposition about a democracy and a dictatorship, or two dictatorships. (At least, not without sounding silly.)
I actually think that looking at the history of war it's pretty clear that democracies are a relatively new phenomenon and you cannot make any conclusions about how frequently a democracy will go to war.
The real message of the assertion that democracies don't go to war with each other is that democracy prevents war
If that were true, then we just need to look at how often a democracy
initiates a war. It shouldn't matter the type of government against which the war is initiated. If the conflict is with a non-democracy, under tyour theory, it would more likely than not be the non-democracy commencing the war against the democracy.
However, the history of democracies shows this not to be the case.
The American Revolution is a war between two democracies.
The War of 1812 is a war between two democracies.
The Civil War is a war between two democracies.
The First and Second Boer Wars were between democracies.
This is not an insignificant number of wars between democracies given how few democracies there were in the eighteenth and nineteenth centuries. If you then add in all the military interventions were initiated by democracies against non-democracies, you'd be hard-pressed to state that democracies are more peaceful than non-democracies.
That's why there is so often resort to the "No True Scotsman" defense. In order to preserve the appearance of democratic passivity, one must narrowly define democracy and/or war. One might also put in an unnecessary caveat that only wars among democracies would disprove the thesis.
If the whole world converted to democratic government, there might still be wars, but I believe there would be a whole lot fewer of them.
Possibly. But I'll make two points...
1) In his most recent book, Fareed Zakaria makes an interesting thesis: democracies are only sustainable if there is a minimum level of prosperity in the society. Otherwise, like pre-WWII Germany, Italy and Spain, they will descend into dictatorship or fascism. If true, then you are confusing the correlation of democracy and peace with causation. It may be that prosperity is the cause of both democracy and peacefulness.
2) It is a romantic notion to think that wars are the products of oligarchs who care nothing for the common folk who die and suffer in war. In truth, foreign wars are often the demise of dictators. The Argentinian Junta, for example, was deposed shortly after losing the Falklands War. Now, this may be because unstable dictatorship use war as a last resort of rallying nationalistic fervor and thus a failed war only causes the deposal of a regime that may have been deposed regardless. But we have scant evidence that democracies are less belligerent than other forms of government.
Mostly, that is because we have very little history of democracies from which to make a judgment at all!