Well, he has been illegally detained by the UK government
If that were true he could have been extradited a long time ago. However, the facts do not match your claim. I don't know whether he is guilty of the rape allegations but what is clear is that he did not appear in the UK court when he was supposed to. It wasn't a simple case of missing an appointment due to a cold or being late to catch a train. He
deliberately and with premeditation decided to not appear and chose to go the the Embassy of Ecuador. Far from being "detained" he
has chosen to impose upon the hospitality of Ecuador. He could have left at any time and appeared in court. He
chose not to.
All along he
has attempted to justify his
choice on the basis of a fear that he would be extradited to the United States. Whether he is actually at risk remains open to question. There has been no indication that the US has requested his extradition, nor any indication that the UK would grant any such request. It is known that the US had previously asked the Australian government whether it would oppose Assange's extradition, as he is an Australian citizen, but while that indicates that the US was considering a request it is not proof that they wish to proceed with one.
When I was a boy the world was flat and now, some people still strive to keep it that way.