Hostility to immigrants hurts ourselves

This article in the New York Times sets forth anecdotal evidence that restrictive visa policies hurt the US economy. High-skilled foreign employees (the kind who get H1-B visas) understandably get fed up with the uncertainty and the short leash that our restrictive immigration regime imposes on them, and they opt to work in places like London instead, ultimately to our detriment.

UPDATE - oh, and illegal immigrants are saving Social Security.