In general I am in sympathy with the Jews and with Israel, but what happened in 1492 was far from one sided.
Ferdinand and Isabella presided over the final days of a struggle that lasted for many centuries: the Reconquista, to reconquer their country and drive the Moors out of Spain, after the Muslim invaders had conquered the entire country except for a few surviving free Spaniards in the mountains.
In 1492, Spain was still threatened by the Muslims of North Africa and by the Turkish fleets. Constantinople had fallen in 1453. Turkish pirates controlled much of the Mediterranean. The coasts of Spain and Italy were raided, and Christian slaves were taken.
Some of the Jews in Spain traded with the Turks. Some of them may have assisted the Turks in their raids and given them information. In the circumstances, a life and death struggle that had gone on for generations against terrible odds, it is understandable that the Spanish were worried about the dangers posed by a Jewish Fifth column. That was basically the reason why they expelled the Jews.
No doubt many or most of the Spanish Jews were innocent of the charge of betraying Spain. But the fears of the Spanish were understandable, I believe. I'm not altogether excusing what happened, but this side of the story is not usually told. The basic motivator was not religious bigotry or racial purity, but a well-founded hatred and fear of the Muslim enemy at the gates and an unwillingness to trust anyone who could not be absolutely relied on.
Fair enough. That's more history than I knew.
I'm not a believer in intergenerational guilt. I like the Spanish just fine. Our community has a bad recollection of those events which will probabaly not be overcome by historic accuracy, since even in your account, the baby was thrown out with the bathwater.
Also, the Jews had money, which was confiscated by the Spanish state. That was a motivator too. The Spanish King was desperate for money.
Maybe you haven't seen that version of the story too much because it's a bunch of nonsense. Trying to say the Jews somehow brought their slaughter upon themselves is the same trash talk that's been going on for centuries. The Jews were kicked out of country after country, exploited, forced to leave without property, forbidden to own land or be in guilds in parts of Europe, and in the case of the Crusades, forced to convert or die, then becoming the focus of rage when their conversions were deemed phony (and you'd think the sword would convince them that Christianity was the best religion.) It was all so twisted and shameful. Best to face the truth of history and move on to the present day.
This Sephardi Jewish website speaks openly and proudly of the historical Jewish collaboration with the Islamic Moors.
The Catholic Spaniards didn't forget this, and were determined it would not happen again after the Reconquista.
http://www.sephardicstudies.org/islam.html