In the case you cite, Q, it was an Afghan family, but all too often we hear of murders of families and murder suicides by non-Muslim families in The New World. And most of them have nothing to do with religion. I think the religion or culture in most of these cases is purely coincidence.

Actually, the US doesn't demand that immigrants adopt a way of life - many never learn English, they live in communities with dense non-English populations or in extended families where they don't have to learn it. To get citizenship some mastery is required. Living with the American legal system is required, of course. But that isn't the same as "they should adopt the values of the society they enter." That suggests there is only one set of values in the new country, and that simply isn't the case.

SRS