Hannah Arendt was a philosopher who was taught by Martin Heidegger and was part of the same tradition of continental philosophy as he was. This style of philosophy tends to consist of verbose pretentious unscientific bollocks. Maybe her 'helpful guide' is accidentally useful but I wouldn't bet on it.
No, conspiracy theorists tend to say what they mean as intended statements of fact. A quick perusal of the internet shows that there are a lot of people who literally believe that the Jews/Jesuits/Illuminati/Shape shifting reptiles are behind all kinds of wrongdoing. I see no evidence that the Nazis' anti-Semitic conspiracy theories were any exception to that.
Given the universality of many people cheating where it is easy and low risk for a large number to do so, given that some states may make vote cheating easier and lower risk for their own reasons then what's your estimate of the number?
By 'fascism' do you mean right wing dictatorship? because 'fascism' was the name of the ideology of the Mussolini dictatorship. I know people tend to use the term now to mean 'any dictatorship I think is right wing' or just 'anything I don't like' and in that way its become a fairly useless label.