@McTag,
I don't bother with any of that stuff Mac.
It is all a result of in-fighting between various sub-sections of those bureaucracies which have charge of spending and which are also fighting each other.
With the higher-ups its about votes and in the undergrowth it's about making waves, reserved parking spaces, office equipment, washroom facilities, dining rooms, entitlements and sheer bloody-mindedness.
The largest and most common ghettos are where the lower-middle-classes concentrate. Or coagulate. Those are designed to surround the more exotic ghettos in case of trouble.