Hitler's ambition was invisible in 1933. Especially his ambition to kill all the Jews, which was a state secret as late as 1941 (insert story about Frau von Schirach, who Didn't Get It as late as Christmas Eve 1941), almost a year after the secret Wannsee conference and Protocol.
By the time you realize what Vlad is made of, like Hitler, you'll be awfully late to the effort to stop him.
I completely disagree.
He tried to violently overthrow a democratically elected government in 1923, and Mein Kampf was in bookstores by 1925.
Before 1933:
Hitler explicitly stated his desire for a Pan-German state that included the Rhineland, the Sudetenland, Danzig and the Polish Corridor, and Austria.
He explicitly stated his intention to colonize vast areas of the Soviet Union with German farm families.
He explicitly stated the necessity to avoid war until Germany had rearmed, and he explicitly stated the necessity to avoid a two front war.
He never explicitly called for the extermination of the Jews.
However, he frequently spoke of the need for a “final solution to the Jewish question.”
That phrase had been used by Kaiser Wilhelm 30 years earlier, and meant the eviction of all Jews from the Reich.