[rmlew]

Jews were allies of the Muslims during the conquest of Spain.
Not exactly. Vandal occupied Hispania was divided between Nicean/Roman Christians and Arianist Vandals. Vandals had there own crusades against Nicean Creed following Chritians.
The Arainist Vandals were forcible converting the proto-Catholics and Jews, or expelling them. The Pro-to-catholic dukes were fighting the Arianists and expelling Arianist subjects, while simply treating Jews horribly.
The Muslims invaded and promised relative religious freedom, but with taxation. Blaming the Jews for collaborating is both stupid and wrong, since Catholics collaborted. The problem was the Arianist-Catholic wars. But right wing Catholics today revise history. It's pathetic civilizational treason, since they are doubling down on the errors that allowed the Muslims to conquer with a small force.

[Varda]

The problem was the Muslim conquest of Spain. Your post is mostly excuse making for the fact that some Jews collaborated. Whether the excuse looks good to you or whether Catholics collaborated or not is immaterial. One group won a war to regain their native territory. They identified other groups as their former enemies. This is a cultural definition, one they had a right to make. This kind of tribalism is a common trait in Europe and among many Americans. My point is that it shapes history and causes events in one century to have profound effects in others.