Arizona rancher Roger Barnett initially faced the possibility of paying $32 million to compensate several illegal immigrants he stopped at gunpoint on his land. He walked away instead with a verdict that rejected any notion he violated the trespassers' civil rights and affirmed that U.S. citizens can still detain aliens crossing the border. What remains to be seen, though, is what impact the $77,800 in damages that a jury Tuesday ordered Mr. Barnett to pay will have on America's larger immigration debate and the efforts of some illegals to get compensation from a country they aren't even allowed to enter....