SCOTUS rulings become much more invasive over all law than you seem to realize. Do not look at this ruling as only applying to Arizona immigration problems. Antonin Sclaia has properly noted that this ruling eliminates 'State Sovereignty'.
It was the rest of the law I was describing as window dressing not the ruling. As for Scalia he’s about 35 years behind the curve. 55 MPH speed limit was the end of state sovereignty.