This is more of an opinion matter, nothing that really requires deductivity or reasoning. Just kind of a "What do you think?"
Hitler had good intentions, I believe. He wanted to first become general of the German army, in which he succeeded. After that, he wanted to strengthen his army, and get rid of those who he thought to be evil. He had reason too, for the 'stories' he was told about them. He was, in my eyes, mislead. When a mislead man is leading, it ends up in Holocaust. He was only doing what was best to improve what surrounded him. However, he killed and tortured many people, based upon religion and race.
Do you think that, because he was 'mislead' in a way, that his actions are rationalized? Personally, I do not. Everyone grows up in a society where they know that killing is, "wrong". Mental ill-ness and environment played a big role, but I'm sure Hitler knew better :/
We stamp the name Hitler on a mass event. At one time a common American attitude was that the French caused the event by demanding that the Germans be financially punished after WWI. Both the British and French then stood by as the German economy faltered. They experienced a devaluation of their currency through super-inflation... which deeply effected an entire generation of Germans. This came after WWI, which was a mind-bending experience for Europeans. It actually ended with a mutiny in the German navy. Prior to that, the Germans had struggled with a feeling of inferiority compared to the British and French. Germany wasn't able to form a cohesive state like the British state. A symbol of this was the fact that the Jews couldn't be assimilated, even though the Germans tried to through public education.
In other words... Hitler was born into an ailing society... maybe suffering from the "sickness unto death"... that is, a feeling that things weren't the way they were supposed to be. The devaluation of their currency was like the bottom dropping out from under them. The situation was like a spring-loaded device... the energy was there waiting to be released. Hitler was part of its release.
A basic rule about morality is this: the more you judge, the harder it becomes to understand... because judgment shuts the door on understanding. The purpose of judgment is to set the stage for action.
The more you understand, the harder it becomes to judge... all things are understood to be evolving naturally. The purpose of understanding is to temper judgment.. to make action more effective. Either judgment or understanding, taken to the extreme, leads to a meaningless situation. Meaning comes from interaction between the two.