Maybe playing the Hitler card is a bit low, but then again Trump did seem to admire a Mussolini quote.
There are two or three kinds of handwringers when it comes to Trump: those who just hate anything different, those who accept that the right of politics is a legitimate position but can see that President Trump is a proposition to be scared about; and the third kind would be the handwringers on the right, who fear Trump because of the damage he does to the more mainstream Republican cause. But it seems that in some people's philosophy only the first kind exists.
Those who hope Trump wins are either doing so out of some sado-masochistic reasons, or see him -- correctly -- as different without paying enough attention as to how he is different. He is different because he shouts, screams, rages and generally doesn't seem to understand the concept of discussion. He is different because he proposes very little of substance, and even the things he does propose are so utterly implausible that if anyone else said them their career would have been ruined. He is different because he is not even "of the people" in any meaningful sense. He is, after all, a billionaire who hasn't necessarily managed his finances very well anyway (famously it's been shown that he'd have been richer if he'd done nothing all his life and just invested what he started with in a few stocks); and who regards a million dollars, ie more money than some make in a lifetime, as a "small loan". He is different because he hits on his daughter in public, makes jokes about women on periods, insults anyone who dares to ask him questions or point out inconsistencies in his position. He is different because he commands the support of the racist, the communist dictator and the leader of an oppressive regime in Russia.
He is different, in short, for all the wrong reasons. Unfortunately, he is all different because he is Donald Trump. For far too many people, who he is matters far more than what he says or does.