Categoric statements like "no one" generally do disservice to everyone. There are many who despise what's been done in the past, and there are many who died in america to fight that injustice when it happened -- men who were killed in Mississippi in the 60s for opposing our racist injustices. We opposed them in our own land, and those evils were stopped. We are not perfect, but we keep trying to do what's right. To an american, that is part of the definition of success -- never give up, never surrender.
There are those who deny the holocaust, and there are skin heads and supremacists in europe -- even in progressive countries like, was it the Netherlands? that had a supremacist nominated for high office and then assassinated?
Does that mean that "no one" in europe has learned the lessons of the 20th century?