I really don't think Malachi was implying that the Lord will witness against those who believe in border enforcement, do you?
No, I don’t think Malachi was writing about border agents.
As I said at the beginning of my post, most scripture addresses individual attitude and behavior. Granted, most of the OT dealt with a theocracy, but NT writers and Jesus spoke to individuals.
I believe that when Malachi mentioned “sorcerers . . . adulterers . . . perjurers . . . those who exploit wage earners and widows and orphans . . . those who turn away an alien,” he was speaking about personal responsibility for good behavior, not government policy.
Thus, because I do fear the Lord, I treat everyone with the love of a neighbor, apart from my sincere wish that government would deal with the legal side of border control and immigration.
Get it? Two issues — government’s responsibility and that of us to be Christlike and kind to everyone in our personal dealings.