Rape allegations are the ideal way to slander any man. As they hinge on the alleged victim's consent, which resides entirely within their mind, they are near impossible to disprove when thrown by a determined, malicious opponent. Even when they are indeed disproved, they still leave a long lasting stain.

Whether Assange committed a sexual crime or not, it is incontrovertible that accusing him of one was the most effective and least risky way to discrete him. It wouldn't even have required any lying accuser either; manipulating a pissed off lover into reframing their relationship with him as less consensual than it was at the time would be a rather simple exercise for a spymaster.