Earlier quoted context omitted.
I suspect Assange does not want to be tortured and murdered and thus does not want this. Are you insane ?
From the article: "The US had offered four assurances, including that Mr Assange would not be subject to solitary confinement pre or post-trial or detained at the ADX Florence Supermax jail - a maximum security prison in Colorado - if extradited. Lawyers for the US said he would be allowed to transfer to Australia to serve any prison sentence he may be given closer to home. And they argued Mr Assange's mental illness…
US assurances aren’t worth the toilet-paper they’re written on.