I really don't want to be extradited to Thailand from Australia because I mocked their King online, or extradited to China for commenting on a Falun Gong forum, or extradited to Saudi Arabia for posting a comment supporting gay rights.
You have probably already broken 100 laws from various countries before you got out of bed
Eg. The US says "it is illegal to do business with Iran" while the EU says "it is illegal to stop doing business with Iran"
Mask mandates vs mask mandate bans make another example.
Suppose I view my diet and exercise regimen as right - should I try to impose (not just suggest) it on others? A country can view both its own laws, and the sovereignty of other countries, as just.
Or look at it this way: Democratic countries tend to think highly of democracy. Higher than any single law resulting from democracy. By imposing your laws on the people of a different country, you are robbing them of that same democracy you so cherish. Would you give up democratic control of your government, if it resulted in passing a couple of laws you liked?
(For certain extreme examples, such as when that country is engaging in genocide or extreme human rights abuses, I would answer yes. But nothing in this case even approaches such severity.)
That would be true only if the US were handling this process extrajudicially. I'm still not sure that would be morally bad, per se, but it would certainly require the exercise of much more power and will.
But in this case, the process is being handled judicially. The people of the United Kingdom elected representatives, who through various means constructed the judicial system and entered into agreements with other countries, including the United States, concerning many things, including extradition. The process they set up to handle that is what is being followed today. This is why I don't really agree that the current situation is undemocratic. It may be that the UK's representatives didn't do exactly what the people would prefer in aggregate, but that is always a danger in representative democracy.
That's ignoring a lot of behind-the-scenes pressure tactics. In fact, your analysis would cast every one-sided deal or law that is the result of foreign pressure (or corruption, or lobbying) as "democratic", unless it's the result of full-on war.
You're only looking from one angle though. Try looking at it from Assange's perspective as GP suggested:
>Whereas I believe the GP was making a _moral_ argument, that Assange deserves it because he leaked US secrets.
You’ll have a hell of a good time exercising this conviction when China starts doing the same.
They’re already doing it to immediate neighbouring countries and have started doing so in the US through basic means of capitalistic influence.
I mean. They think they’re right. Why shouldn’t they? Who cares about nations having so called “sovereign” laws? What does your 1st amendment rights mean when China thinks you shouldn’t have it?
It would be truly upsetting if that ever happened, but mainly because so many of China's laws are bad, not because of something inherent about national borders. Fortunately I doubt China will ever have the will to use its power to bother me.
(One other case where the US does this: child sex tourism. The US will prosecute its own citizens if it finds they travelled abroad to have sex with a minor, even if the violation of the law takes place entirely in another country, even if the other country declines to prosecute the crime or even if it sees it as not being a crime. Prosecuting these crimes that are done abroad seems eminently moral to me. I suspect the actual objection to prosecuting Assange is probably more truly centered in whether what he did was even a crime, or wrong. The question of whether the US ought to be able to prosecute him is really a proxy argument.)