[Excuse_My_Bellicosity]

Yeah, the Dog better walk the line but some fence-jumper has carte blanche to break the law, even if he's a felon.

[Badray]

As someone else pointed out, the man signed an agreement to be picked up anywhere, anytime and then broke the agreement. It's not so much that he broke Mexican law, but that someone was being paid to protect the guy and got embarrassed by Dog's capture of him. It's banana republic vengeance, not justice.