Well, the jews were killing millions of christians and thousands of germans in the Soviet Union. I would have felt threatened too. Ever heard of the Wolgadeutsche? No? I supposed so.1. A Christian, both Roman Catholic and German Lutheranism, that viewed Judaism (belief system, not racial) as an inherent threat to Christianity. While not innocent of anti-semitism, the Catholic church, of which Hitler was a member, was much more tolerant and cosmoplotian than the virulently antisemitic slant of the Lutherans of the time.
France I don't know, but the jews were expelled from Spain in the XV century for supporting the moors' invasion, there is anti-semitism there, and the italians, they are even more anti-semitic than germans even today, why? I don't know.2. A strong volkisch sensibility in Germany, that was more pronounced than that of other more diversified Central European states. In camparison to relatively "wordly" nations such as Italy, France, Spain, etc., the German population had a much stronger sense of race. Coupled with a realtively consistent view of Jews as outsiders, which is prevalent in countries of the most liberal leanings, e.g. the U.S., it is no suprise that Jews were ostracized and treated as interlopers.
The nazi rhetoric did have an anti-bourgeoisie component, but they were not exactly anti-rich.3. The relative sucess of Jewish peoples in business and Finance coupled with the above are sure recipes for persecution. Also, the financial architects of Versailles, were also perceived as Jewish. This treaty was the personification of all National shame, misery and woe. The majority viewed the peace settlement as a yoke forced upon Germany by malevolent foreigners. Stripped of a workable military, by the drafters and signers of Ver., and left for dead economically, the time was ripe for insurection and revolution.
Same like today, socialists are useless for normal jobs so they look for refuge in universities. It's not like they are in universities because they're smarter, more like lazier and in desperate need of recognition.4. A repudiation of the attempted Red takeover in the turbulent post war era. Amovement that within Germany was largely supported and fomented by the University based intellectual class, a disproportionate number of whom were Jews.
Wanna know why the nazis hated the jews? Stop wasting everyone's time, just read Hitler's Mein Kampf.
http://www.amazon.com/Mein-Kampf-Adolf-Hitler/dp/B00171AEKW/