Because your point is fucking stupid at best and harmful at worst. Women take self defense classes, go to the restroom in pairs, barely trust their male friends, and are terrified of traveling alone even if it's for something like work. Why? Because they know how easy it is to "put themselves in a position to be vulnerable." And you want to keep rubbing it in? Make them even more responsible than they already feel subconsciously? Fuck you. It's not helpful. Instead of grandstanding for rape victims to take responsibility just shut up. It's free and you won't have so many people calling you a rape apologist.