I can agree with everything except "shoot on sight". That's where you lose people. (me, at least) I realize that your SN is EEE, but that type of extremism is counter productive.
Once a border is guarded properly, I would simply continue direct deportations as they occur.
I work with a nurse who's son is a Border Agent in California. If the border agents are shot at, they are not allowed to shoot back. I guess all they can do is ask politely, "please don't do that anymore."