Indeed. The biggest cause of World War II was the Treaty of Versailles. The nations of Europe largely seemed to completely ignore their own very recent history. The Congress of Vienna in 1815 kept Europe out of major war for 100 years, and how did it do it? By not punishing the people for the leaders' actions. Yet, that's precisely what they did in Versailles and as a result Germany fell into economic ruin, and basically paved the way for a nationalistic leader like Hitler to take control.