Nothing is as simple as it seems. The Grauniad is almost certainly going to be pro-Assange (in many ways, quite rightly) because it was the UK newspaper that published the WikiLeaks material. There is always the issue of a potential venomous and vengeful legal case in the US. However, although there is no suggestion that Assange is a serial rapist or even an unsavoury groper, unlike a well-known figure (DSK) mentioned earlier, that doesn't mean the allegations are automatically invalid or that they shouldn't be pursued. (Let me remind you of the black cab driver who spent years raping women because the police didn't believe that a man with "the knowledge" would do such a thing.) He is a slippery creature – perhaps he has to be to run WickiLeaks in the first place – and he is perfectly willing to be less than completely open with the truth about himself.
Of course, it is absurd to suggest that if you are innocent, you have nothing to fear but please remember we are talking about Sweden which I would suggest is a far more civilized and rational country than this one and certainly one that spends a lot less time than the UK hanging on to the US's coat tails.
Just for the record, I profoundly hope that Assange is innocent of the alleged assaults.