Argument: Illegals have incentive to have babies w/o birthright citizenship
"Go back where you didn't come from." Economist.com. Aug 12th 2010: "Denying American citizenship to the American-born children of illegal immigrants may have a slight dissuasive effect [...] on births to illegal immigrants already in the United States, but that effect, too, will be slight compared to the overwhelming incentive for having babies, which is pretty much hard-wired into our systems, for good or ill. I'd be surprised if revoking birthright citizenship led the number of babies born to illegal immigrants in the United States to fall from 8% to 7% of total births. That leaves you with a whole lot of American-born non-citizens."