So to say that Jews had priviliges or advantages over other Poles is an anachronism. There was no concept in those days of any sort of equality, people weren't thought of as individuals but as groups and each group got screwed by some other group.
The excerpts I have posted clearly show that Polish Jews had privileges, along with Polish Catholic nobility and royalty, over all the rest of the Polish Catholics. So Jews were not the only privileged ones, but these excerpts do examine the situation of the Jews in particular. Jews may not have owned land and no one did unless they were the nobility or royalty. But, and I would be happy to provide more excerpts, Jews were allowed to be mobile, marry, and divorce. Serfs (the majority) could not be mobile, and had to have permission from the lords to marry.
When your millions of of oppressed peasants got too upset at their predicament, the ruling class (nobility or church) had a good way for them to let off steam – they blamed it on the Jews and encouraged pogroms. Then things quieted down. The problem is that many peasants never saw through this manipulation, and they believed the lies that were told to them. Some, like you, still believe it today.
They also blamed it on, and rioted against, nobles, members of royal divisions, and even at times clergy. Jews were part of the oppression, and so they were blamed as well. They were active agents, not passive objects.
I actually have some Jewish background. I simply choose to look at history without any loyalty to any particular group or narrative.