@ dharmicdalek
Interesting to know that that kind of far-left thinking appeals to you; the sort that prefered Hitler and Stalin to the democracies.
Wars are always heavily influenced by previous wars; but there are many factors at play that have precious little to do with them. The suggestion that there would be no Hitler or Stalin were it not for World War I is highly contentious at best. World War I was a factor for their rise, not the cause. The fall of the Romanovs was a matter of time, advanced rather than caused by the war, and the main factor in favor of the Bolshevik coup against Kerensky was the Provisional Government's disorganization. As for the rise of Hitler, a dissatisfaction with post-Wilhelmine democracy, unemployment, and the increasing control of the streets by NSDAP and KPD street gangs had much to do with Hitler's rise to power. Indeed, the previous government to Hitler's was fatally wounded by the Defense Ministry's report on the Berlin Transport Strike of November 1932, which showed that the government was helpless in situations like that where Nazis and Communists worked together.
Even if Hitler's and Stalin's rise were directly attributable to WWI, there is another consideration. Perhaps WWI would not have happened had such far-left thinking prevailed during the Balkan Wars, the Scramble for Africa, the Spanish-American War, the Russo-Turkish Wars, the Franco-Prussian War, and the Crimean War. But maybe they would not have happened had such far-left thinking prevailed at the time of the wars of 1848, the Napoleonic Wars or the French Revolutionary Wars. Maybe they would not have happened had it not been for the Seven Years' War, or the War of the Spanish Succession. And so it goes on, back to the dawn of time.
As it was, that sort of thinking did prevail on the far-left at the time of WWI. I'm surprised you didn't know that; perhaps you should read up a bit on the history of socialism. They held endless peace conferences. All over Europe, the working class ignored them and went to war. To my mind, that is one of the greatest reverses that socialism ever suffered; for the first time it showed the inability of the left to mobilize the working class. As far as that sort of logic prevailing once the war had started, all it would have done would have been to ensure that German invasions of Belgium, France, and Russia went unopposed. That would have certainly resulted in another war at some later date, but the fact that unjust wars breed other unjust wars seems to be something you have entered your calculations. Still, the misery and captivity of the masses has never really bothered the far-left unless it be as a means to control them.
Be that as it may, the far left has never found it hard to support what it considers to be just wars. These usually involve the support of tyrants, the only proviso being that said tyrants were working against the strategic interests of the capitalist powers. After that, every crime, up to and including genocide, can be explained away or denied. See Katyn, Ukraine, China, Cambodia, Bosnia, Kosovo, Sudan, Rwanda...