Yes, he's an obscenity. Even more obscene is the fact that large numbers of Americans like what he has to say — including many who do not support his candidacy, and a good number who never would admit they agree with him.
There is a strong proto-fascist element in the USofA. Few go so far as to join the neo-Nazi groups (united behind Tr*mp, of course), but xenophobia, racism, and a widespread willingness to sacrifice individual liberties for a feeling of "security" are endemic.
The demagogues, of course, dare not deliver such feelings of security for fear of losing their hold over their trembling followers. The sheep must continue to believe that the wolf truly is puffing at the door.
What does it take to turn "soft" racism (as recently evidenced by Justice Antonin Scalia) into virulent antagonism? Whatever it is, Islamist State and Fox News both seem to have found the recipe.