Sweden doesn't owe a guarantee to Assange, sure. What I find very telling however is that Assange has made it clear that if he were given the guarantee, he would go to Sweden willingly. Why haven't the Swedish authorities taken him up on that offer? Only one reason springs to mind...
Even if the guarantee isn't binding, it strikes me as odd that the Swedish haven't made one. Say they gave one to him, and he stayed true to his word and came to face the charges. Then, after he was acquitted, he is arrested and faced extradition to the US. He objects, saying he has a guarantee that this would not happen...the judge laughs and says that such a guarantee is not binding. He loses, Sweden wins.
In all honesty, I think it is quite clear that the Swedish are refusing to cooperate because they have powerful people breathing down their necks. Someone wants Assange to go to jail.
Even if the guarantee isn't binding, it strikes me as odd that the Swedish haven't made one. Say they gave one to him, and he stayed true to his word and came to face the charges. Then, after he was acquitted, he is arrested and faced extradition to the US. He objects, saying he has a guarantee that this would not happen...the judge laughs and says that such a guarantee is not binding. He loses, Sweden wins.
In all honesty, I think it is quite clear that the Swedish are refusing to cooperate because they have powerful people breathing down their necks. Someone wants Assange to go to jail.