Do you know what's so uncomfortable about this? It shows that perhaps one of the most evil men in history was a human being; That, on occasion, he could be nice, even flirty. Thats not all, you want to see evil people as evil, screaming horrible stuff over 20 microphones with 20,000 men saluting them; The evil is clear and recognizable then. This shows a completely different image, it scares you because that means that evil isn't a stereotype, that evil isn't recognizable, that evil could be in anyone. It scares you because evil could be lurking inside anyone, maybe even inside of you.
"Every villain is a hero in his own mind" -Tom Hiddleston