Barbara Tuchman believed WWI was accidental and unnecessary.
Later research by German scholars into German High Command records show Tuchman had it all wrong.
The truth is the German High Command in 1914 did want war, and not a small war, but a major war which would begin with German invasions of Belgium & the Netherlands -- their Schlieffen Plan.
German High Command motives were simple -- Russia and France were growing economically and militarily so fast that if there was no war in 1914, Germany would not be victorious in a future war.
That's why the German High Command pushed Austrians into issuing an ultimatum to Serbia and then invading.
They also refused to let Kaiser Wilhelm order a last-minute stand-down of mobilizing German armies.
My point is, war in 1914 was no accident, but rather was intended by Germany and totally necessary for the allies.
Today, it would also be necessary against Russia if Vlad the Invader becomes as unhinged as some suggest he could.