I have long been fascinated by one focus of Europe's history - the collapse of Germany in 1918, the Paris conference and the resultant short lived Weimar Republic. Colonel House's collected letters reveal the progressive breakdown between him and his most trusting master, President Wilson; House was close to the murderous taste for revenge of the French after the UK and US had won the war for them. Who knows whether Hitler would have arisen had not Wilson's intentions been perverted and Germany's humiliation been so complete?; as a footnote, the US almost repeated this vicious humiliation in 1945 until good judgement ditched the evil of the Morgenthau Plan for the beneficent Marshall Plan.
The Novels of Alfred Döblin - particularly November 1918 and Tales of a Long Night rather than Berlin Alexanderplatz - give a truly authentic insight into the thoughts, feelings and beliefs of Germans during those times, and Youtube has (in two parts) the 3-hour Die Legende vom Dolchstoß und der Vertrag von Versailles by Bernd Fischerauer which I cannot commend too highly.
The counterpart argument for the causes that fuelled Nazism to that of Versailles being too vindictive is that of Germany's military defeat being unfulfilled. Nigel Farage put the case during the annual Tom Olsen lecture at St Bride's, reported by the Guardian.
I firmly believe that there's no right answer to this and no one viewpoint has the truth of it - but that all informed debate on history is good, and it's right that fixed opinions on all sides are ever open to challenge. And Good on Mr Farage for contributing to the debate.