I'm not sure that can be applied consistently. Would you say the same about heads of drug cartels or human trafficking rings (not equating these to Kim, as I'm sure you understand)?
I think you should build your argument a little bit more.
I’d say, why not say that also for drug cartels? The only reasonable argument that comes to my mind is that some big cartel head might have local government influence, but that does not apply to Kim and New Zealand, right?
Another possible argument would be that the damage has been done elsewhere. But in the case of the dtug cartel, if there are victims in 20 countries that why would any third party have priority for enforcing their law?
> if there are victims in 20 countries that why would any third party have priority for enforcing their law
That's not really relevant. No one is arguing priority. "Priority" implies there's 20 countries fighting to prosecute someone and we need to resolve it. In this case, it was a cooperation between multiple countries who agreed someone needed to be prosecuted, regardless of which country did it.
The point being why should any argument in this line end up with “lets extradite him to the US”, when he is already in a cooperating country that will enforce acceptable local law. And his own country, where he resides, and where the did the purported crimes.