They are not "blaming" Trump.  They are saying that Trump has allied himself with antisemites, and refuses to part ways with them. Trump certainly has no personal problems with racism, antisemitism, sexism, or any other form of institutionalized hatred. Why should he? He is rich, white, male, nominally Christian and narcissistic. He is at the top of the heap, and his interest in the real problems of anyone who isn't Donald Trump is essentially nil.

No, not all Trump supporters are racist or antisemitic. Too many of this sad bunch are.