That hardly counts as stressing the need for intense loyalty to a strong Fatherland (before Zionism became widespread) or worrying about pollution of that Fatherland by inferior races (?).
A Jewish woman is prohibited from marrying a non-Jew (that's why Jewishness is determined matrilineally), but in any case I'm objecting to "ethnic nationalism wasn't even much of a thing". It most certainly was.
Here's my op-ed that uses long-term orientation, probabilistic thinking, numeracy, consider the alternative, reaching our actual goals, avoiding intuitive emotional reactions and attention bias, and other rationality techniques to suggest more rational responses to the Paris attacks and the ISIS threat. It's published in the Sunday edition of The Plain Dealer, a major newspaper (16th in the US). This is part of my broader project, Intentional Insights, of conveying rational thinking, including about politics, to a broad audience to raise the sanity waterline.