Correct, two people: the victim and the criminal. Going back to your example, a victim who gets mugged after choosing to walk down a dark alley is still the victim. They do not share responsibility or fault for the crime. They share responsibility for being in the same place at the same time. The victim making a choice that puts them in the wrong place at the wrong time is not at fault for that crime. I believe you are using the word blame in a broad sense that encompasses both the criminal action and the poor choice. But by using the word in the two senses and then equating them, you end up equating the actions, intentionally or not.