Gun registration almost inevitably leads to gun confiscations. But along the way, people on the gun owner registry can enjoy the added bonus of inevitable data breaches that expose their identities to the public including criminals who would like to steal their firearms.
This has happened (yet again) in New Zealand in recent days. Government bureaucrats in Kiwiland exposed the personal info of registered gun owners, supposedly by mistake.
Mistaken or not, the damage has been done.