Is Hitler's racial ideology one key to understanding his strategic mistakes in World War 2?

How important are Hitler's racial views in understanding his decisions in World War 2?

Here is an extract from Hitler's speech to the Reichstag declaring war on the USA in 1941. 
It's racism is equally vile and preposterous. 

While an unprecedented revival of economic life, culture and art took place in Germany under National Socialist leadership within the space of a few years, President Roosevelt did not succeed in bringing about even the slightest improvements in his own country. And yet this work must have been much easier in the U.S.A. where there live scarcely 15 persons on a square kilometer, as against 140 in Germany. If such a country does not succeed in assuring economic prosperity, this must be a result either of the bad faith of its leaders in power, or of a total inefficiency on the part of the leading men. In scarcely five years, economic problems had been solved in Germany and unemployment had been overcome. During the same period, President Roosevelt had increased the State Debt of his country to an enormous extent, had decreased the value of the dollar, had brought about a further disintegration of economic life, without diminishing the unemployment figures. All this is not surprising if one bears in mind that the men he had called to support him, or rather, the men who had called him, belonged to the Jewish element, whose interests are all for disintegration and never for order. While speculation was being fought in National Socialist Germany, it thrived astoundingly under the Roosevelt regime.

Roosevelt's New Deal legislation was all wrong: it was actually the biggest failure ever experienced by one man. There can be no doubt that a continuation of this economic policy would have done this President in peace time, in spite of all his dialectical skill. In a European State he would surely have come eventually before a State Court on a charge of deliberate waste of the national wealth; and he would have scarcely escaped at the hands of a Civil Court, on a charge of criminal business methods.

This fact was realized and fully appreciated also by many Americans including some of high standing. A threatening opposition was gathering over the head of this man. He guessed that the only salvation for him lay in diverting public attention from home to foreign policy. It is interesting to study in this connection the reports of the Polish Envoy in Washington, Potocki. He repeatedly points out that Roosevelt was fully aware of the danger threatening the card castle of his economic system with collapse, and that he was therefore urgently in need of a diversion in foreign policy. He was strengthened in this resolve by the Jews around him. Their Old Testament thirst for revenge thought to see in the U.S.A. an instrument for preparing a second "Purim" for the European nations which were becoming increasingly anti-Semetic. The full diabolical meanness of Jewry rallied round this man, and he stretched out his hands.

Source -

https://www.jewishvirtuallibrary.org/jsource/Holocaust/hitler_declares_war.html