Good point with the warning signs. I think Hitler was always driven by hate and given to hateful speeches and writing, including his infamous book. He and Stalin also emerged from turmoil of WW I, bloody revolutions, socialism (nazis are socialists). But I admit I don't know enough about other fascist dictators to generalize.

It's just that Hitler's story is the complete opposite of Trump. There are zero similarities there. What motivation would Trump have to go on a killing spree among the US population?