I don't get how they are perceived as victims in this case. It would require some harm to come to them and in that case it didn't matter is some app was involved or not.

The harm would matter and guess what, we already have laws for that. It doesn't matter whether you killed a guy with your car, a gun, a bow, an axe, a piece of wood or you computer. What you will be punished for is killing him.

And there is no blame here. Only consequences. If you share your information it may be used by third-parties for purposes that you don't much like. If you jump out of a 3th floor window, you may die. We don't have a problem with telling people that they shouldn't jump out of buildings.

Stating that there is likely to be some consequence for a particular action -- whether it is going down to the shady side of town, running in an old abandoned building or eating twenty pizzas a week -- doesn't mean blaming the people involved. A rape victim doesn't deserve being raped, but the chances are higher if she is in a particular place.