The UK is grossly unfair in its extradition process but it has one rule that it does stick to; It won't extradite where there is a chance of the person being extradited getting a death sentence. The UK is strongly against the death penalty.
That is why Sweden is involved in this.
Sorry, but no. Like the UK, Sweden - who abolished the death penalty in 1921 - will not extradite a person to a country where they risk facing capital punishment. There is no support here for the notion that Sweden (or the UK) would be conspiring to nail Assange for anything other than the alleged crime he is suspected of. Sometimes, a cigar is just a cigar.