I have to agree with Chris57, "Nazi ideology [cannot] be separated from atrocities." I am an avid reader and I have read many books on a variety of ideologies; some out of curiosity. Mein Kampt was one of those I read out of curiosity. Mein Kampf is a 2 volume book by Adolf Hitler published in 1925 & 1926 . It combines elements of Hitler's autobiography with an exposition of Hitler's political ideology.
A thorough answer to your question is best answered by your reading Mein Kampf. Hitler's rise to power was in competition with communists and other political groups in competition for power at that time. Hitler believed force necessary for any political party to rise to and maintain power. Hitler's Nazi ideology was built on hatred and fear of other groups. He used this hatred to build a party amongst the downtrodden masses. Intricate to his ideology was his message that communism and Judaism were trying to take over the world and both were responsible for the downtrodden state of the masses. Hitler believed the Jews were behind the communists and the Jews were out to control government, commerce and the media.
Hitler's and the Nazi's rise to power would not have occurred but for the aforementioned ideology of Adolf Hitler. So, the answer to your question is the Nazis would have been notorious whether or not they committed genocide on a massively epic scale.