Comment by majormajor

It's really not. Many people are strongly inclined to believe claimed victims and disbelieve reflexive "I didn't do it" claims. Accusations have a lot of strength generally.

Does "believe victims" avoid triggering your feelings better?

It just happens in this case that the accusations flow predominantly one way due to common behavior differences between men and women, and historically it's been one of the areas where the allegations were least believed by the legal system* so "believe women" becomes shorthand for "believe claimed victims of sexual harassment or worse."

Consider the stories around Weinstein or R Kelly. "Open secret" sorta thing where people in the know avoided the guilty party. Yet nobody took it seriously enough to take legal action. There are a lot of other crimes you couldn't get away with in the open like that for so long.