French Revolution - Root of All Evil?

As I read through history, I come to the conclusion that World War 2 was just the finale of World War 1.  The cause of World War 1 really lies with Bismarck and his desire to get revenge, through the Franco-Prussian war, on the French for Napoleon's humiliation of the Prussians in the Napoleonic Wars.  The only way Napoleon could come to power was though the excesses of the French Revolution.  The French Revolution theories trace back to Rousseau, so I conclude that Rousseau was source of evil of so many of today's problems.