What I'm not sure you have admitted is that you obviously cannot compare the intermarriage rates across groups to...
That a population which is 2% of the general population marries each other around 40% of the time does not give us good reason to disbelieve what they are telling us about...
And while a 40% intermarriage rate does not prove that they are ethnocentric, it does not contradict what we would predict if they were, and so is not evidence against the proposition. Even if it were, the totality of...