Even in the case of US citizens, if Mommy and Daddy break the law — maybe rob a bank — they both go to prison, and their children are separated from them. Unless you want the kids to get put into prison too.
A lot of these kids are brought here by traffickers (coyotes). And even if the kids really are brought by their parents, Mommy and Daddy broke the law. Sometimes that means families are separated.
I feel no outrage over this.
Or as I like to put it, when [the H-person] goes to jail, Chelsea loses her allowance.