Because character assassination without proof, especially if you have something you consider proof to show, is a dick move.
Some dude thinks some other dude is inappropriate towards women. I'd much rather hear from the women, and not some random dude who has nothing to do with the situation, and whose opinion does not matter. Why is it always some man telling other men, and women, what is right and what is wrong. Apparently the chauvinism of that situation escapes said men completely.