It wasn't the fact that the Jews killed Jesus (they didn't), it was the widely held belief that they did (due to mass brainwashing by the Catholic Church for many centuries) which lead to enormous anti-Jewish sentiment, with effects lasting to this day.
The anti-Semite is afraid “of himself, of his own consciousness, of his own liberty, of his instincts, of his responsibilities, of solitariness, of change, of society, and the world of everything except the Jews.” He is “a coward who does not want to admit his cowardice to himself.”
Jean Paul Sartre
Excellent post!