Posturing
The current global security situation is not a good one for concentrating talent into big clumps easily targeted by ICBMs. Planting seedcorn elsewhere is a valuable long-term investment when a wacky guy with gout can apparently make Silicon Valley a radioactive wasteland on fairly short notice. Let the DACA recipients go from this territory but expand your global workforce. The need for fallbacks outside North America grows.
Biting the hand that feeds IT
