Millions of people have "sacrificed themselves", in the sense that they died fighting to get rid of the nazi regime, and tens or hundrends of thousands also sacrificed themselves by going into the resistance, aiding jews and other fugitives, sabotaging german camps in occupied cities, etc. There are lots of recorded examples of people who faced the firing squad singing or shouting for freedom. So he always had that option too.
>I have mixed feelings about this. In hindsight he could have run away at point #1, but how was he to know how things would have ended?
Hitler had broad mass appeal for over a decade. He wasn't some crazy dictator who suddenly imposed himself upon the German people. What he preached was actually a general sentiment, repeated by lots of intellectuals, politicians and pundits in one form of another, as was the "historical role" of Germany etc (come to think of it, not that unlike "Manifest Destiny" or the idea of "exceptionalism").
He had detailed his plans, including racial hatred and even extermination, and he had given several bloody examples. He not only was voted for in '33, but he continued to have great popular support even after the war started. It was not just silent forced compliance. Millions applauded those actions, even going out of their way to enable them.