Isn't this more commonplace than we think it is? Including in the US? This is a prominent item in the UK news right now: Gary McKinnon - Wikipedia, the free encyclopedia
The guy was hacking into US military computers and is fighting extradition to the US where he will likely serve a stiff (possibly life) sentence. I have no idea whether he deserves it or not, but it's interesting that he is to be prosecuted in the US for something he did in the UK, and neither is he a US citizen.
I don't personally see the confusion here. The internet makes this entirely reasonable. He did, after all, commit an act of crime against the US, albeit whilst he was in the UK.
And if we're to really stretch that definition, isn't that the same situation as Osama Bin Laden, wrt committing a crime against a country whilst being abroad?
Or am I missing something (again!)?