The question itself is, I guess, clear enough, but here is some context:

While I don't disagree antisemitism is indeed a horrible thing, and people participating in discrimination and persecution of Jews did not hold views I support, I believe all humans, however biased, tend to assign some kind of rationale to their actions (even if that rationale is ultimately not logically sound).

Now, I know modern western antisemites usually reference a theoretical "Zionist Occupation Government" or some other hypothetical global organization that secretly orchestrates the world as they see fit for their goals, while muslim/arabic antisemites say they hate Jews for their actions in relation to Palestinians and estabilishing the State of Israel.

In similar fashion, I'm sure there is information about what reasons people committing pogroms and killings in Middle Ages and later during the Renaissance period used to justify their actions. What were those reasons? Did they evolve in any way during this period?

​

Thanks!