because if a defendant is presumed innocent, he should not have to defend himself.

That is OK as far as it goes but we do seem to have reached a point in cases like this - where witnesses have to defend every aspect of their life and and it is OK to imply (and not having to prove) that they are guilty (of something) even when it is not them who are on trial.

If we run out of witnesses who are prepared to subject themselves to this unfairness in court (especially those who have already suffered any attacks or abuse) - is justice ever going to be served?