Earlier quoted context omitted.
Perhaps they are prosecuting him because he is accused of committing a crime?
It seems that the word "rape" is somehow exaggeration. Per Wikipedia (assuming it is reliable source here, hasn't checked sources it cites) "On 20 August 2010, two women, a 26-year-old living in Enköping and a 31-year-old living in Stockholm, reported to the Swedish police that Assange had engaged in unprotected sexual activity with them that violated the scope of their consent. "The next day, the case was transferre…
He tried to claim that this wasn't rape in both Sweden and England (the dual criminality element which is required for extradition) and that was rejected by the court.