It is actually difficult to exactly pinpoint the driving force behind Hitler's rise but speaking on broad terms, it is likely the aftermath of WW1 and the treaty of Versailles if were honest. Hate speech always needs a context and an environment. — Wittgenstein
This is true; zeitgeists are notoriously difficult to nail down, but none the less they are a real factor. Hitler wasn't just "whistling Dixie". A lot of his speech was directed toward solving German problems in a not altogether novel way.
Germany did have a problem feeding itself. It imported a lot of feed and fodder, as well as meat and fruits and vegetables. Contrary to the upper-midwestern reputation of German-American farmers, the methods of farming in the old country wasn't all that efficient. Parts of Germany (under the control of the Junkers) did much better. The population had grown quite a bit, and heavy wet soils just aren't that good.
Other European countries had similar problems. Denmark's large pork and dairy production depended on imported feed and folder. The UK wasn't self-sufficient in food. Ditto for the Scandinavians. France had a much better farming-food-population situation. The USSR had large, fertile wheat growing areas. Eastern Europe also was self-sufficient in food (my guess).
Then too Germany didn't have that magic black stuff, petroleum, to which a lot of modern industrial activity had shifted. They had coal, of course, with which their chemists worked wonders, and some iron ore. Besides all that, they imported as much high quality metallurgical ores as they could financially manage, up until the late 1930s.
If one loathed Jews, then Germany and Europe had a "Jewish problem".
A student of history would note that United States, among others, improved our economic prospects with a "take it easy, but take it" approach. The sniveling 13 states that began our country's existence had big plans well beyond the eastern seaboard. True, we bought the Louisiana territory, but the rest -- a lot -- we just snatched from Mexico. Same approach with Florida, Puerto Rico, the Philippines, Hawaii, etc. We exterminated most of the Indians, at times one by one, at other times en masse. And, famously, we built a lot of our wealth on slave labor. Hitler was quite familiar with our methods.
So Hitler's speeches were preparatory to war as a tool of economic salvation. He may not have said so at the beginning -- that would have been highly impolitic -- but he and the Nazis worked patiently at revving up the war economy, getting people to focus on Jews as THE designated problem (if they didn't already think so), and so on. Various institutions like the Gestapo made sure that the German people fell into line, and stayed in line.
So, the point to all this is, Hitler wasn't just about hate. Hate was a tool. His grand design was intended to solve the German natural resource problem--Lebensraum, and more. Great Britain solved their resource problem with empire; the Americans did the same thing on the North American land mass. France, Belgium, Holland, Spain, Italy, the Turks, the Austrian-Hungarians, Japan, Russia -- all had accumulated colonies or used territorial expansion, much to their economic advantage. Hitler intended to unify Europe, whether Europe wanted to be unified or not, and whether the Europeans wanted the Germans to be in charge of the unification or not.
So, here we are now. Europe is unified (sort of) and the Germans are the keystone in the structure.