when we don't know who is really the victim.
A decent proportion of the abuse claims turn out to be dodgy for one reason or another, and some are clearly motivated by money, the desire for fame or attention (me victim). This only serves to damage the genuine claims, which usually form part of a pattern of abuse.
http://www.huffingtonpost.co.uk/entry/john-oliver-monica-lewinsky-public-shaming_n_5c8f452ee4b0db7da9f527f6