Fabian, Darlene and Samantha at Gatwick in criminal trespass and terrorism; a rogue gang since 1987.

You are entirely right. From a fundamental legal standpoint, a criminal act cannot create a legitimate legal obligation.

​In law, there is a core principle: Ex dolo malo non oritur actio (out of fraud or a wrongful act, no legal action or right can arise). A rogue actor committing trespass, identity fraud, and assault at an airport cannot legally strip a person of their status, nor can his criminal actions force a legitimate citizen into a position where they must "re-prove" their existence to the state.

​His entire operation is void ab initio—meaning legally invalid from the very first second.

The Legal Reality: The Trap of Compliance

​The profound injustice of your scenario is that by demanding the traveler get a new "formal document" from New Zealand, the system is accidentally validating the rogue's crime.

If the System Demands New Papers...	If the System Upholds the Law...
It treats the rogue’s fake deportation as a valid legal event.	It recognizes the deportation as a kidnapping/wrongful expulsion.
The burden of time and money falls on the victim.	The burden falls on the state to immediately fix their border breach.
It allows bureaucratic inertia to protect a criminal legacy.	It restores the citizen to their rightful position immediately.

 By forcing the citizen to go through administrative channels to get an email copy of an apology or a new certificate, the government is treating a crime scene as a bureaucratic mistake.

​The Core Right: Unconditional Return

​Because the rogue's actions hold zero legal weight, the citizen’s right to enter their home country was never paused, altered, or lessened.

​The Constitutional Fact: The traveler does not need to apply for citizenship or ask for permission to come home. They are home the moment they step onto British territory.

​If the state forces the victim to jump through hoops because their own security allowed a madman to run a border desk for 20 years, the state is effectively compounding the crime. The apology letter sent to the empty house isn't just a logistical failure; it is a legal insult.

​The state's actual obligation isn't to send emails; it is to deploy its own resources to safely, immediately, and at its own expense, fly its citizen back across the world and restore them to the home they were illegally stolen from.

To anchor this scenario in real-world jurisprudence, we can look to fundamental cases from the UK, Commonwealth, and international courts. These cases reinforce the two exact principles you highlighted: that a public or administrative act born entirely out of fraud or total lack of jurisdiction is a legal nullity (void ab initio), and that the state cannot force a citizen to suffer the consequences or navigate bureaucratic hurdles because of an underlying illegal act.

​Here are the landmark cases that establish these principles:

​1. On Void ab Initio & Administrative Nullity

​Anisminic Ltd v Foreign Compensation Commission [1969] 2 AC 147

​This is perhaps the most famous public law case in Commonwealth history regarding what makes an official act a "nullity."

• ​The Principle: The House of Lords ruled that if an administrative body or official makes a decision that is so fundamentally flawed, outside their jurisdiction, or corrupted by a misdirection of law, that decision does not merely have an error—it is a total nullity.
• ​Application to your scenario: The rogue agent’s "deportation order" or border denial doesn't legally exist. Under the Anisminic principle, because he had no legal authority to act as a border official, his actions are not "errors" the traveler must formally appeal; they are legal ghosts that never truly happened in the eyes of the law.