Note that "I will come to your soil if and only if you make such and such promise" is not deciding how their justice system should work. It just means that if they don't get the promise, they will not come to their soil. Likewise, we could point out that Sweden has no right to force someone out of their jurisdiction to turn themselves in.
> What I don't remember was any reasoning on why he thought it more likely that he'd be extradited from Sweden to the US rather than from the UK, who are particularly close?
Sweden has a history of extradition, the treaties aren't the same… and though at the time Assange wasn't formally charged by the US, if I recall correctly he did have (founded) suspicions that a grand jury was put on his case. At the time, his chances of being extradited from Sweden rather than the UK were higher.
> you've drunk the koolaid and are in full defense mode
Someone has gone full attack, and I suspect this is not just about "striking a balance".