It just doesn't make sense, because he had nothing political to gain. However, the answer could be discovered in a private conversation that Napoleon had with Dr. Barry O'Meara, which took place on the Island of St. Helena. On the 10th of November 1816, Dr. O'Meara (who was Napoleon's personal physician at the time) asked the Emperor point blank as to why he was encouraging and supporting the Jews. The Emperor Napoleon replied, and I quote, "My primary desire was to liberate the Jews and make them full citizens. I wanted to confer upon them all the legal rights of equality, liberty and fraternity as was enjoyed by the Catholics and Protestants. It is my wish that the Jews be treated like brothers as if we were all part of Judaism. As an added benefit, I thought that this would bring to France many riches because the Jews are numerous and they would come in large numbers to our country where they would enjoy more privileges than in any other nation. Without the events of 1814, most of the Jews of Europe would have come to France where equality, fraternity and liberty awaited them and where they can serve the country like everyone else."
During the different periods of Napoleon's career, his sympathy for the Jews was clearly noted. He did everything he could to assure that the Jews were treated on an equal basis as Catholics and Protestants
http://www.aish.com/jl/h/h/48945221.html
And then is was destroyed by them...
The Napoleonic Wars
The Rothschilds already possessed a significant fortune before the start of the Napoleonic Wars (1803–1815), and the family had gained preeminence in the bullion trade by this time. From London in 1813 to 1815, Nathan Mayer Rothschild was instrumental in almost single-handedly financing the British war effort, organizing the shipment of bullion to the Duke of Wellington's armies across Europe, as well as arranging the payment of British financial subsidies to their continental allies. In 1815 alone, the Rothschilds provided £9.8 million (in 1815 currency, about £566 million or US$869 million today, when using the retail price index, and £6.58 billion or US$10.1 billion when using average earnings) in subsidy loans to Britain's continental allies.
One of the smaller city houses, Vienna. A collection of far larger Viennese palaces known as Palais Rothschild were torn down during the Second World War.The brothers helped coordinate Rothschild activities across the continent, and the family developed a network of agents, shippers, and couriers to transport gold across war-torn Europe. The family network was also to provide Nathan Rothschild time and again with political and financial information ahead of his peers, giving him an advantage in the markets and rendering the house of Rothschild still more invaluable to the British government.
In one instance, the family network enabled Nathan to receive in London the news of Wellington's victory at the Battle of Waterloo a full day ahead of the government's official messengers. Rothschild's first concern on this occasion was to the potential financial advantage on the market which the knowledge would have given him; he and his courier did not immediately take the news to the government. It was then repeated in later popular accounts, such as that of Morton. The basis for the Rothschild's most famously profitable move was made after the news of British victory had been made public. Nathan Rothschild calculated that the future reduction in government borrowing brought about by the peace would create a bounce in British government bonds after a two-year stabilisation, which would finalise the post-war restructuring of the domestic economy. In what has been described as one of the most audacious moves in financial history, Nathan immediately bought up the government bond market, for what at the time seemed an excessively high price, before waiting two years, then selling the bonds on the crest of a short bounce in the market in 1817 for a 40% profit. Given the sheer power of leverage the Rothschild family had at their disposal, this profit was an enormous sum.
