I'm no expert, but my impression is that society in Eastern europe in the end of the middle ages was more feudal than western europe, so the middle class was less developed. The Jews filled a need, which was good for both poland and the jews.
No particular expertise is needed here. We're talking grade 6 history classes, or perhaps Grade 10 if you want a little more detail. Jews were not invited to Poland at the end of middle ages but in the first part of the 13th century, although they have lived there a century or two before that. Every part of Europe was as feudal at the time as any other.
But that doesn't mean that the common people welcomed the Jews. Most people don't like foreigners moving in in large numbers, and neither did Polish people. So to say that Poland was nice to the Jews is true of the kings and some of the nobility, but not necessarily true of the common people.
You are correct. That was true of all countries where Jews lived. Well, maybe some exceptions applied. When in the early parts of the 20th century, till 1939 Jews enjoyed equality and were at the forefront of Polish intelligentsia and the academic world, they were not welcomed in the likes of Harvard of Yale. Those noble schools had quota limiting how many Jews could study there. As a matter of fact, those anti-Jewish quota existed till late 1960's in some American universities. Jews, Blacks and Poles were in the same basket in the great US of A until Martin Luther King (not ADL or Polish American Congress) decided to do something about it.
But the teachings of the Polish catholic church demonized Jews in the popular imagination and also contributed to anti-Jewish feeling.
The Catholic Church demonized Jews. Polish Catholic Church was a part of it. Did you ever come close to reading about the Spanish Catholic Church? German? French? Same difference, only far more lethal for Jews than in Poland.
And they also streamed out of Poland and Russia from the 1880s onward.
There was no Poland and Russia. There was Russia and Poland was occupied by Russia. The laws under which Poles lived then were set by the Russians, not Poles. Were there antisemitic sentiments? Sure. It's so easy to find a culprit in a Jew for pretty much all maladies of a country. The entire Western Europe did it. Russians found a way of doing it in Poland too.
fter WWI, polish policy toward Jews drove hundreds of thousands of Polish Jews to the west.
Now you've revealed your ignorance on the subject of your own people. There were no hundreds of thousands of Jews in Poland after WW2. If you want to study the history of your nation please do it honestly. Use historic material, not some kibbutz gossip.
The continuity of Jewish civilization in poland for so many centuries is not due to the love of Poland for all things Jewish.
So what? What kind of argument is that?
No love for Jews in Poland and yet Jews survived there for over 800 years. The West loved Jews and yet Jews left for Poland. Go figure. With the friends like the West who needs enemies, eh?
Oh, and a question to you: did Jews come to Poland for the love of the country or its people?