While the issue of the migrant caravans has largely dropped off the media radar lately in the midst of the shutdown theater drama, the problem hasn’t gone away. If anything, the swelling number of migrants waiting in the Tiajuana area is festering as the migrants grow frustrated with the long wait for their claims to be processed. (American officials are processing up to one hundred per day, but there is already a waiting list in the thousands.) But surely they must have known they were going to run into these sorts of logistical problems, right?Not really. Many of them seem...