But it's important to keep in mind that the vast majority of rape accusations are true[1], and this likely carries over to accusations of sexual and gender-based harassment as well.
Statistically, it makes sense to give the accuser the benefit of the doubt. I'd rather unfairly tarnish the reputation of a small minority of the accused, than attack the reputation of the accusers (the vast majority of whom truly are victims of a terrible, heinous crime).
This doesn't mean that the accused shouldn't get a fair legal trial. But I think it does affect how they should be treated by the court of public opinion (until they are exonerated, in the rare cases where that actually happens).
[1] http://en.wikipedia.org/wiki/False_accusation_of_rape#Estima...