Not to defend US justice system, but Assange allegedly jeopardized US national security, which is in the interest of US to protect. If Assange was in a country

Not to defend US justice system, but Assange allegedly jeopardized US national security, which is in the interest of US to protect. If Assange was in a country that had no treaties with US, say for example Iran, he could avoid extradition easily, not so easily if there are strong agreements on both parties like UK and US have. There are reasons why he wasn't in Iran or Afghanistan, one of them is that his life would be in more danger there than in any western court. If Assange was extradited from Sweden, the country he escaped from, which is still an European country, he had the certainty that he could not be sentenced to the death penalty, that's a non-negotiable option if US ask for extradition from EU. UK will not be EU anymore starting from 1st of February 2020.