What you need is awe:
a feeling of reverential respect mixed with fear or wonder.
One can be fascinated and full of fear at the same time. Then maybe he can hate the person/race. But one cannot hate someone and be fascinated from him in the same moment.
It seems you want to relate to hatred, more than fear. Still I feel it is a better choice than rest of the answers. It could mean a positive or negative feeling (can be awesome or awful) or mix of both. I have seen its usage to be fitting to your usecase:
- awe-inspiring : either impressive or shocking/dreadful depending on context
- in awe of : overcome with amazement or fear or both
As for your comment, I would rather use awe to describe Hitler's effect than any of the answers mentioned. Also it is hard to combine different emotions/feelings which are exerted differently
- hatred: you exert your anger on to someone (in the moment of hating, what made you hate is another story)
- amaze: something impresses you, emotion caused by outside entity
- fear: someone's actions make you percieve threat, again caused by external entity
Consider causation, for hatred to exist you need to be fearful, disgusted or something that causes you to be indifferent, which is very contrasting to fascination.