Why should they care? It's not like this young, innocent American citizen was their son, brother, nephew, friend, etc. I'm sure he was special to somebody. Just not to them.
Anyway, enforcing our immigration would just get in the way of cultivating new voters, or the NAU, or whatever.
Yep, where’s a border agent when you need to arrest one? Or hasn’t Mexico ordered us to do that in this case?