It's a fair point, but I guess my thought is that so many men talk about how many good men there are, yet this happened with thousands of men seeing it and doing nothing. And with a website title like "Without her knowledge" it's pretty obvious that there are a whole lot more men involved in this type of behavior.
Those men also go to work every day. They walk amongst us as though they aren't frequenting a site like that in their spare time. Many probably have wives and families. And women are supposed to believe "not all men" but it is - for the most part - only men.
You do not see websites like this designed for women because women, for the most part, just aren't predators like this.