You look at the Australian journalist who was working in China as a journalist and was imprisoned for vague charges, and there's an outcry.
Look at the Australian citizen who was captured half a world away they're trying to drag to the US for crimes under US law that weren't committed in that country - is there a difference? It could be argued the case of Assange is even worse. Imagine if China decided Assange was guilty of crimes under Chinese law and reached out like this, the outrage would be palpable.
Even the deputy PM has recently came out and said Assange shouldn't be extradited - https://www.abc.net.au/news/2021-12-14/barnaby-joyce-opposes... and said similar things.