So Joshua did as Moses had said to him, and fought with Amalek…. And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed. But Moses’ hands were heavy…. The Lord will be at war against the Amalekites from generation to generation. – Exodus 17:10
Antisemitism is an irrational fear and hatred of Jews. It lies dormant in every population until something comes along and ignites it, at which point it spreads like a wildfire, or a cancer, or a virus. It quickly infects the entire population, which then turns against the Jews to kill any who cannot escape. Such an impulse exists only against the Jews and no other ethnic group. A few ‘rational’ explanations may be offered. For example, ‘race mania’ and ‘insane jealousy’. Regardless, the Jews are completely blameless. Any suggestion to the contrary is actually a sign of antisemitism.