Education & information systems must improve, no argument here. It's incredible that mao and stalin's crimes aren't taught at school, or glossed over.
But most people know at some level these people are almost all evil (not churchill imo even though I'm not a fan) whether they say Hitler was the worst or not. People aren't idiots. You just gotta prompt them to think beyond their first instinct.
Adolf, btw, deserves 100% of the scorn and negative press. He was a repugnant and retarded war criminal who somehow grabbed defeat from the jaws of victory because of his fixation on aryan supremacy. Reading about Hitler outside of Hollywood, MSM, McGraw Hill , including Hitler's own writing, reinforces this.
Broader point: We must stop relying solely on conventional channels. There's high quality, accessible literature out there. Would I like to see it reflected in MSM? Yeah. But it's easier to slowly realize that our information diet must change, where mainstream media is just one part of it.