In the post-enlightenment Europe of the 19th century the highest authority was no longer the Church. Instead it was science. Thus was born racial anti-Semitism based on two disciplines regarded as science in their day - the 'scientific study of race' and the Social Darwinism of Herbert Spencer and Ernst Haeckel.
Hatred is corrosive of a person's wisdom and conscience the mentality of enmity can poison a nation's spirit instigate brutal life and death struggles destroy a society's tolerance and humanity and block a nation's progress to freedom and democracy.