Vitriol against Jews has been around since the Middle Ages at the very least and pops up in almost every culture I can think of. The Nazi leadership were obsessed by it, just to name one obvious example. I'm generally very optimistic about humanity, but this is really our heart of darkness.

btw, "Heart of Darkness" is a great book. Did you read it?

Many times. Also saw the movie. (Apocalypse Now)