i'm not so sure about this. The difficulty is that for a cliff richard the stigma can hang around, but there are people on botg sides. For a relatively anonymous person a false accusation will give them public presence only on that one issue, and the internet being what it is, one article saying 'accused of' will hang around longer than any late quiet dropping of a case.
Its easy to get rabid about protection, but having seen employers make horrible inferences about people just to try to fire them, i know that tactical accusations (of the no smoke without fire type) are made all the time. 'paedophile' is the new nuclear accusation for 'weirdo' or 'new person we dont know who us male' even schoolkids throw it around, so its risky to autobelieve.
On the other hand, when there are genuine cases where there is danger, then publicity is useful. Its how you decide when its real..after the result seems safest but even then there are distinctions eg a picture of a minor in a wealth of 'normal' porn would still carry the charge 'making and distributing images involving children' even if the image is of a 17year old acting and being explained as a 21 year old, with the 'defence being that you were unaware.
This could devastate a life, family, children,grandchildren, and ruin a family financially, just because of people's tendancy to catastrophise, so its extremely difficult to know what to do when accusations are 'possibly has looked at porn'
I think this should be distinct from accusations of actual harm.