Question: why don't the immigrants just declare themselves Americans wherever in the world they are? Why do they need to cross the border?
If the person you are talking about is such a horrible person, and there are so many horrible people like him in America, why do you want more people to be subjected to them?
I never once claimed folks with these extreme xenophobic views represent any kind of majority in any given nation. They're a vocal, often violent minority. Their voices are getting louder these days, but so it goes with squeaky wheels.
I also never once claimed he was American. In fact, if I had to make a guess, I'd say he's a right wing European. But that's just a guess and isn't terribly relevant.
If the person you are talking about is such a horrible person, and there are so many horrible people like him in America, why do you want more people to be subjected to them?