Poland was an exception. Spain was an exception. Portugal was an exception. The Papal States were an exception. Prague was an exception. Those exceptions do tend to fill up the map, don't they?
Jews prospered in Poland for most of their history there, actually.
Portugal was an exception.
Ruled by the same people ruling Spain.
The Papal States were an exception.
I'm not aware of any massacres of Jews in the Papal states.
Prague was an exception.
Not aware of this one, either.