Hitler was an “idealist”. He was also a socialist, a vegetarian, a teatotaller, an antichristian, a non-smoker, childishly sentimental* and a dilettante. If he were alive today and living in Wisconsin, he’d be on the liberals arts faculty of a third rate publicly funded school.
*He luft docs undt shildern.
The Communist Party USA opposed the US striking out against Nazi Germany until Hitler betrayed their beloved Stalin.
The Communists were not anti-Fascist.
You left out psychopath. I bet he would get a high score on Dr. Hare’s PCL-R checklist for Psychopaths...