It is not only the racism, anti-Semitism, and bigotry and now violence of the White Supremacists which are offensive, but also the rush of the two US parties exploit the situation to clean their records and to attempt to pose as enemies of racism when both parties have been beneficiaries of White Supremacies since their inception. The campaigns by Reagan and later by Clinton were clear political movements which aimed to woo white voters on the basis of resentment and offensives to blacks and minorities. The blatant wing of the White Supremacist movement in the US is a manifestation of the work of the two parties who mobilized white voters against minorities and women: witness how both Reagan and Clinton led racist campaigns against welfare recipients. As for Obama, he will be remembered as the president who condemned white racism far less than any recent white president. You can look it up. White media loved Obama's speeches on race only because he managed to fill his rhetoric with nuances which intended to absolve whites (and his white grandmother in particular) from responsibility. It is quite jarring now that the test of one's opposition to racism is merely the ability to offer a statement against the neo-Nazis in Charlottesville. In other words, Trump is an extension of Reagan and Clinton--and even of Obama.