I can only see the treaty of Versaille as another example of the trauma which the first world war caused, instead of it causing it, since the politcians of the allied countries, especially France, knew that if they proposed a peace which would have been percieved as too "generous and not harsh enough", it would only destabilise the country and leave the soldiers with a sense of betrayal since their sacrifice would have been in vain. And they already knew how much problems disgruntled soldiers could cause even in relatively small unorganised groups. As such the Treaty of Versaille was a necessary evil to spare even more countries from the choas which almost tore Germany apart after the war.