That's not how the entire fabric of international law works though.
Citizenship and postal address are irrelevant. If you break the law in another country and there is an extradition treaty then you will face the consequences.
So if I buy something from a Saudi Arabian e-commerce site am I at risk for extradition from Ireland to Saudi Arabia for the capital offense of being gay?
Clearly I was gay while doing stuff online on a Saudi Arabian server.
Extradition is covered by a patchwork of treaties and laws most of which involve some kind of human judgement as well.
One core concept of extradition is the crime has to be, at least in broad strokes, illegal in both jurisdictions.
The crime in question also has to have some reasonable argument of jurisdiction for the requesting state. You might have been gay while buying things from an SA company, but you weren't doing anything in an interaction with SA that had anything to do with being gay. (The first dual criminality concept protects you way before having to think about this). It is also often the case that countries are reluctant or outright refuse to extradite their own citizens and choose to try them in court locally.
Assange wouldn't be protected by either of these. Conspiring to take classified military secrets with a member of the military in question would be illegal everywhere. As would participating in the taking and the following distribution.
The legal questions for Assange are "did he do those things, guiding, requesting, and helping Manning acquire and send the classified information?" "Do the first amendment protections of free speech and free press cover WikiLeaks model?" and "Would Assange receive a fair trial and just punishment if extradited?"
Whether or not the requirement is met in Assange's case is to be decided by the court. There are certainly laws in the UK that prohibit hacking. Anyway, you are wrong in general about how extradition works. People are often, for example, extradited on murder charges.
When I said I was being gay I meant I was both giving and receiving homosexual acts while shopping in Saudi Arabia.
Oddly, being gay is a crime in Saudi Arabia, but only committing homosexual acts is a capital offense. I would make a joke about the type of kangaroo court that would convict me of being gay, but it’s sad because they exist and people are convicted.
If the Irish government has an extradition treaty with SA covering that crime and the Irish government has decided to extradite you, then yes. However, no such treaty exists and the Irish government would never do it.
The key with extradition is that it has more to do with diplomacy, geopolitics, and sovereignty than anything else.
> So if I buy something from a Saudi Arabian e-commerce site am I at risk for extradition from Ireland to Saudi Arabia for the capital offense of being gay?
Probably not, because that's not within the scope of what Ireland would be willing to extradite for.
But that's a question of Saudi Arabia’s practical ability to bring you to trial, not one of whether or not any law they have would apply to you on principle.
> Assange broke US laws that he was never subject to, as an Australian living in Europe.
That's not how laws work. Laws are limited in territorial applicability only to the extent that the sovereign adopting them so limit them, and basically no government would fail to hold foreign coconspirators in a crime occuring within their domestic jurisdiction immune to prosecution (some might not have the practical means to bring such an actor to justice, and some might not choose to apply them in most cases as a matter of policy priorities, but that's a different issue.)
Citizenship and postal address are irrelevant. If you break the law in another country and there is an extradition treaty then you will face the consequences.