The Jersusalem Post opines that racial animosity arises from conflicting interests even in neutral, pacifistic, diversity-worshiping America:

Though US President Donald Trump is a philosemite and has proven to be a major ally of Israel, many of the issues that he has advanced – anti-immigration, America First, anti-globalism – are shared by blatantly antisemitic conservative politicians. Indeed, a number of political pundits have noted that, leaving aside Patrick Buchanan’s anti-Israel and antisemitic rhetoric, there are remarkable similarities between Trump’s campaign and the issues championed by Buchanan during his unsuccessful 1992 and 1996 presidential campaigns.

As a result, the supporters of men like Buchanan have shown thrown their support behind Trump and have been emboldened by Trump’s victory. Because Trump is dependent on this constituency for its support, he cannot easily disassociate himself from them or openly criticize them.