If NZ wants to alienate one of the world's largest markets, their largest military ally (and the guarantor of their security, particularly in their shipping lanes) to stick up for a foreign national running a criminal copyright conspiracy on their soil, they're free to do so. Don't get all huffy when they decide not to let that happen.
In that perspective, I feel the wrong is on the other governments, not on the US.
All of Europe refuses to extradite to the US if the death penalty is a possible outcome: http://en.wikipedia.org/wiki/Extradition#Bars_to_extradition and futher down it mentions "France, Germany, Russia, Austria, the People's Republic of China, the Republic of China (Taiwan) and Japan" flatly refuse to extradite, something that is certainly not true of the US.
I don't support this at all, but I'd let you be taken because you do. That'd end this sooner than your double standard.
In different contexts, I don't think such double standards would be controversial. For example, certain European countries refuse to extradite to the U.S. who might be sentenced to the death penalty, even though they expect the U.S. to extradite people to them who might be on trial for say fraud. I would argue that the double standard there is totally justified too.
Our level of persecution of whistleblowers? Or is that optional?
Oh, you mean basic values like the belief in perpetual copyright.
And your example isn't a double standard, the prisoner being accused of something that's a crime in both jurisdictions and the punishment not being unconscionable in the destination are the basic assumptions of extradition. The double standard is the USA playing political games with trade tariffs, etc to get someone who hasn't committed a local crime.
So it's more like me having extracted your friend's wallet and turning to you with bloody knuckles and asking politely for your wallet. No violence. To you. Because you're not going to say no.
I think you meant Pakistan not Iraq or am I mistaken?