Some folks just need to be killed.
And some folks ought to have a real scare put on them - like the Immigration officer that let this turkey go the other times he has been apprehended.
Perhaps a visit from an officer to impress upon him that (by my count) five officers have either died or been shot at because of his "criminal negligence" in letting this guy loose might help.
Personally, someone ought to pistol whip the guy.