"In the EU the do extradite 419 scammers. France and Germany has gone down to Nigeria to extradite those 419ers".
My comment was made in good faith, the only extraditions I am aware of have been of individuals who carried out scams in this country at some point (i.e. they actually came over to collect money). Or to the US, who as we are learning have their own rules. So do you have a reference for an example?
In any case, allow me to present another example: criticising the Chinese government. I imagine there would be a few bloggers/reporters left rather non-plussed to discover our eager-to-please government was packing them off to China to face their particular brand of "justice".
To be clear, I have no support for McKinnon himself. Normally I wouldn't say something as crass as "he did it, now it's time to pay" since he has never been tried, but a confession under no apparent duress makes it pretty much a forgone conclusion. Clearly he's an idiot who did something sane folks would know is going to get them in trouble. If he didn't get some kind of punishment he'd be lucky.
The point is, we have our laws, they have theirs. We have to have a proper system to deal with this kind of thing, and unfortunately we don't have a credible one. If he had done something actually bad (as opposed to doing them a favour by highlighting their own ineptitude), or if the US didn't have the death penalty (cue US officials promising to see him burn), detention without trial (cue Gitmo) or torture (cue the cute question "well when you say torture...") it would be an easier sell. But to top it off, a reverse arrangement is not in place and we aren't even trying to use McKinnon to see it done. In fact it's very unlikely to happen because it's a flagrant violation of the US constitution, and what does that tell you? Even the Merkins think it's a bad practice.
The fact is there are just too many reasons why it doesn't fit a British idea of justice. Even if you think white collar crime is under-punished in this country, it's still our law.