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https://en.wikipedia.org/wiki/Sicut_Judaeis
The words sicut Judaeis ("As the Jews") were first used by Pope Gregory I (590-604) in a letter addressed to the Bishop of Naples. Around 598, in reaction to anti-Jewish attacks by Christians in Palermo, Pope Gregory brought Augustine's teachings into Roman Law. He published a bull which became the foundation of Catholic doctrine in relation to the Jews and specified that, although the Jews had not accepted salvation through Christ, and were therefore condemned by God until such time as they accept salvation, Christians were nevertheless duty-bound to protect the Jews as an important part of Christian civilization.

LOL!!! Mark my words, if Christianity didn't exist, Jews wouldn't exist. The people hated the jews, everywhere, all the time. The church always prevented the extermination of these goblins so they could wreak havoc constantly. Christianity was their great victory over us, offering them eternal protection and a monopoly on banking.

Without christianity stopping them, the people did what was natural, killed the aliens running the obvious scams on them:

The Rhineland communities were relatively wealthy, both due to their isolation, and because they were not restricted as Catholics were against moneylending. Many crusaders had to go into debt in order to purchase weaponry and equipment for the expedition; as Western Catholicism strictly forbade usury, many crusaders inevitably found themselves indebted to Jewish moneylenders. Having armed themselves by assuming the debt, the crusaders rationalized the killing of Jews as an extension of their Catholic mission.

The pleas of the clergy were ignored on similar grounds (no cases against individuals were brought forward for excommunication) and the mob believed that anyone preaching mercy to the Jews was doing so only because they had succumbed to Jewish bribery.

Albert of Aachen's view was that the People's Crusaders were uncontrollable semi-Catholicized country-folk (citing the "goose incident," which Hebrew chronicles corroborate)... aka regular people who didn't really believe in christianity and so dgaf what the clergy preached and did instead what they knew was right, to kill the scammers milking them dry.