[beezdotcom]

However, I am not convinced the answer is as some have suggested, to lock up 13 million people in jail.

Actually doing it may not be feasible - but I think you need to convince those 13 million that they might become one of the subset who DO get locked up, or you have no deterrents against breaking the law. I just don't think a fine is enough of a deterrent, since they pay coyotes more than that to get here.

[Ursus arctos horribilis]

It took decades for the 11-30 million (no one has any idea how many there are) to come in one at a time, I am for decades to deport the sorry criminals one at a time.