It is cruel for these children's rights to citizenship to be denied.
Civil rights are the rights of citizens, period. And that is what this case is about. We are never hurt as a country when we broaden the circle of citizenship, or rights that attach to it, generally. And we frequently benefit. All we have to do is think about women's rights, the right to vote, marriage equality, and so on.
We have to win this one...a victory for civil rights. It would represent a victory for the regard that we have for what it means to be accorded the right to our full humanity.
The Mexican government would do well to exercise some leadership on this issue, too.