Was Hitler's genocide against Jews done out of personal hatred or did he do it to maintain power? In other words, was genocide a political tool he used to accomplish his other goals, or was genocide of Jews something he personally wanted?
What do we know of Hitler's motivations? Did he consider extinction of Jews a moral good?
Well, I am sure someone else can absolutely answer this question better than I, but I would love to give it a shot!
From what I have read, and what is outlined in Der Fuehrer: Hitler's Rise To Power, written by Konrad Heiden, Adolf Hitler adopted his opinion from the mayor of Vienna at an impressionable young age. The mayor, Karl Lueger, was a rabid anti-Semite and that impacted Hitler's views without a doubt.
Hitler at the time, around 1908, was attempting to gain entrance to the Vienna Academy of Fine Arts, but failed twice as we know. From this point on, the future leader of Germany was pretty much penniless, and I remember reading that he had to sleep on park benches, and eventually a homeless shelter. Instead of placing blame on himself for his shortcomings, he adopted that the ideas that his poverty, and others, could be placed on the Jewish population, and that they were in fact responsible for the economic pit of despair many Germans found themselves in.
During this time, the aforementioned Karl Lueger was ranting and raving about the Jewish "infestation" which is indicated in the book Unruly Masses by Wolfgang Maderthaner. Lueger made it a point to remind the people that Vienna once lived in a great golden age, and now was living in a considerably darker one. What I was actually suprised to find by reading Unruly Masses, was that this view against the Jewish population was considered a popular and "fashionable" thing to do! But thinking about it, uniting the people in a hatred for a people would be a politically savy move.
After the Beer Hall Putsch, in which Hitler found himself in a cell, he produced Mein Kampf, a poorly written document containing his ideas for the future of Germany as well as a dogma centering around the hate of the Jewish people.
A quote from Mein Kampf: "The foremost connoisseurs of this truth regarding the possibilities in the use of falsehood and slander have always been the Jews; for after all, their whole existence is based on one single great lie, to wit, that they are a religious community while actually they are a race-and what a race!" Page 173, http://www.angelfire.com/folk/bigbaldbob88/MeinKampf.pdf
Hitler, taking from Lueger's idea, believed that the reason Germany was in turmoil was mainly due to the Jewish people. In fact, they both used this to gain political influence. Leuger died in 1910, so he could not use it to as great of an effect as Adolf Hitler obviously. He used this hatred to gain power, and then to maintain it if that answers your question.
However, that being said, Adolf Hitler's initial aim was not to eradicate all the Jewish people, but simply to remove them from the equation. In fact, in 1940, Franz Rademacher proposed to Adolf Hitler and Heinrich Himmler something that would be known as "The Madagascar Plan", or a plan involving the mass deportation of Jews to that small island off Africa. https://www.jewishvirtuallibrary.org/jsource/vjw/Madagascar.html
With the obvious infrastructure issues, that plan failed. So the question regarding the ensuing extinction as a moral good, seems to me that it was just an ends to a mean. That it was not necessarily a good or bad thing to him, because the Nazi's saw those they were massacring as sub-human, which is an issue that we see arise in history time and time again.
The establishment of death/work camps, and wholesale slaughter of the Jews, gypsies, blacks, cripples, homosexuals, and various dissenters was a political goal of Hitler and his supporters, but for him personally, it was not his ultimate goal. His ultimate goal, outlined by the man himself, was to establish a "Third Reich that would last a thousand years."
Like I said, someone else flaired and more knowledgeable could answer this better than I, but I gave it an effort! Please leave any helpful advice or criticism on what I could do better!
Hitler can be viewed in two ways:
the planner
He simply hated the Jews and killed them because of Deep hatred
The opportunist
There was a lot of anti-jew reteric at the time, he manipulated policies and propaganda to monopolise on this to gain votes in the Reichstag
OK to answer the question:
We may see the Germans as highly efficient now, but they were chaotic when Hitler was in charge. They followed an idea now known as "working towards the führer" where people in the regime would make radical ideas based on something they heard Hitler say or one of his ideologies to please Hitler. This is how most Nazi policy was carried out, such as the euthenasia programme and the 'final solution'