Afterwards, he was banned from USA.
Soon we'll have to arrest everyone for drinking alcohol, because that's against laws in some countries, we'll have to arrest all women for driving, because that's against the law elsewhere, etc. etc.
The list is endless, and, IMO, pointless.
This is inaccurate in a number of ways. Certain American laws are, on their face, restricted in territorial applicability (others are explicitly not, others are neither explicitly limited nor explicitly unlimited and the application requires reference to principles beyond the individual law in question), and, particularly, certain protections of the Constitution have been held unenforceable against the government in the context of certain actions outside the territory of the United States.
But you can't correctly make a blanket statement that US law is not applicable outside of US territory.
No, they aren't (unless you are using "US National laws" as a label you've made up for laws that are restricted to US Nationals and the territory of the US.)
For online businesses it's a lot more risky as your customers and operations may be located anywhere.
(I'm not sure where you got the idea that citizenship bears any relevance at all here)
US LEAs might have a hard time harassing people like me if EU countries stopped coöperating with them.
Russia pretty much got away with murdering Litvinenko in London; if they'd done that to a natural-born UK citizen in the UK with no other ties to Russia, and unambiguously, there would have been much more serious consequences.
Well, up until now. It was so clearly a political decision to ignore it when it happened and now that relations with Russia have deteriorated it's been investigated and the obvious conclusion reached.
The CIA could have someone with 'CIA' on their jacket shoot a UK citizen on the street in broad daylight and the UK would avoid investigating it if it was politically inconvenient to do so.
Jeffrey W. Castelli, Rome station chief received a 7 year prison sentence
Robert Seldon Lady, Milan station chief received a 8 year prison sentence
I'm referring to Her Majesty's government: Italy isn't the US's poodle the way the UK is, the thread was discussing the non-action of the UK government due to political inconvenience
I get that, but figured it would still be worth noting that other EU states have previously done this.
But if the CIA just dragged him back to America and turned him over to the US Marshals it wouldn't impact his charges.
There is no recognized right to be a fugitive.