Hitler is almost universally and variously described as a visionary, an economic genius, a lady's man with impeccable manners, a non-smoking health fanatic, a lover of animals, etc.
The left really didn't have any problem with him when he rolled over France and bombed Britain. Rumors of detention camps were dismissed as over exaggerated. A few on the left abandoned their defense when he launched the infamous "crystal night" in November 1938, but for the most part, they stuck with him until he attacked their even bigger hero Josef Stalin. That for most of them was the defining moment.
“That for most of them was the defining moment.”
It was certainly the tipping point for the CPUSA, including that scumbag agent of influence Dalton Trumbo.
Ever wonder why the hollyweird left loves him so much?