But Jews are unique in that they chose to spread out into different countries, but at the same time retain their own cultural and religious identity. They choose to live amongst Gentiles, yet hold Gentiles at Arms-length, with muted disdain perhaps. Isn't the point of assimilation to integrate with different cultures and different people in order to gain trust and understanding.
Mmmm... Throughout history Jews have assimilated. You just don't know about it because those Jews... assimilated. Heck you could have some Jewish ancestors who converted if you went far back enough.