In this case, things are constantly happening that shouldn’t actually be possible unless you look at them from a different angle.
We have to stop believing that there was really an interest in leading an investigation into a sexual offense
Assange learned about the rape allegations from the press. He established contact with the police so he could make a statement. Despite the scandal having reached the public, he was only allowed to do so nine days later [..] Assange appeared at the police station to make a statement. [..] At the beginning of the conversation, Assange said he was ready to make a statement, but added that he didn’t want to read about his statement again in the press. [..] But that same evening, everything was in the newspapers again. It could only have come from the authorities because nobody else was present during his questioning. The intention was very clearly that of besmirching his name.
That is a further indication that Sweden was never interested in finding the truth. [..] Swedish officials can travel to the UK, or vice versa, to conduct interrogations or that such questioning can take place via video link. During the period of time in question, such questioning between Sweden and England took place in 44 other cases. It was only in Julian Assange’s case that Sweden insisted that it was essential for him to appear in person.
Assange’s lawyers petitioned Sweden’s highest court to force public prosecutors to either finally press charges or suspend the case. When the Swedes told the UK that they may be forced to abandon the case, the British wrote back, worriedly: «Don’t you dare get cold feet!!»
Keep in mind, this is the UN's special rapporteur on torture, not some random opinion. Further on in the article:
When a country like Sweden declines to answer questions submitted by the UN Special Rapporteur on Torture, it shows that the government is aware of the illegality of its behavior and wants to take no responsibility for its behavior