Hitler did believe he was doing the right thing by exterminating vermin to purify the human race, the Jews were a priority, but there were others in the queue if he wasn't stopped. One thing that gets me is people always say it was Hitler, but he could not have accomplished what he did alone without the help of so many other Nazis who believed the same crap.
Best intentons". Not for all. Hhe believed in the survival of the fittest, whom he thought were the German Volk, and so gypsies, Jews, disabled, political dissenters were to be done away with.
Not a man with a softened conscience. He had "best intentions" towards Germany, in terms of how he saw things. He believed in a conspiracy theory very common among right-wing Germans that Germany lost WW1 because of betrayal by the Jews.
In particular there were left-wing groups not keen on the war, especially at the end of the war, when was had caused so much grief, and often some of the leaders were Jewish by origin (although frequently they were atheists in religion). This was plausible enough to deceive some whose sense of self-esteem was tied up with Germany's pride, people thinking from their hurt emotions rather than making proper studies. So he would see himself as purging a not truly German community.
But it was all highly tendentious, because Jews made many contributions to German success, eg many scientists like Einstein, notable mathematicians etc.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.