Hitler was a monster, comparable only to such monsters like Winston Churchill (he killed millions of people in Bengal) or George Washington (he killed millions of Native Americans). It's important to know that Hitler was inspired by England as explainded by Manuel Sarkisyanz in his book "Hitler's English Inspirers: Based on Lectures Given in Heidelberg University".
Hitler and his ideology was of US/English creation
"(...)One might recall that in 1923, the German businessman and patron of the arts,
Ernst Hanfstaengl,
who worked for US intelligence, helped Adolf Hitler buy a printing plant and begin mass production of his Nazi newspaper. While the Fuhrer himself was quite self-confident and raved on (literally) about revolution, he also imperceptibly absorbed Hanfstaengl’s ideas about the need for German friendship with America and Great Britain.
There is no way the abysmal horror of German life at that time could be summed up in a single sentence. Or perhaps it can: people were now buried in cardboard bags instead of wooden coffins.
Ernst Hanfstaengl presented his friend Adolf with a thousand dollars. Did all this happen arbitrarily? (...)"
source:
https://orientalreview.org/2013/06/...ited-states-have-no-desire-to-prevent-wwii-i/