But that doesn't make it okay for others to do.

We should be working to decrease it in all exclusionary groups by working to make them more inclusionary. That means intentionally rotating comfort zones.

And it is a historically seductive siren call that once an immigrant community in any country attains some power, they use it to ramp up exclusion and cronyism.

In all fairness, to protect their tenuous grasp on that power from external racism, but it also succumbs to use for less noble, more human ends. E.g. getting ones friend hired.