This shows a complete lack of understanding of much of anything. Niggers, blacks, light skinned, dark skinned, "tethers" and fba, and all manner of "black" all fight among themselves.
Orthodox, secular, atheist, left wing, right wing, pro israel, anti israel.. jews all fight among themselves.
Whites are jsut like this too, we all fight among ourselves. As you put it, no matching set of interests. Hell, even scots-irish appalachians like myself have disagreements over stuff. You have the dumb ones that identify with the retarded IRA, and you have ones that know their roots and look down on the non Ulsters.
Truth of it all comes down to being a bit more complex than "niggers and jews stick together, why don't we"