Fair point, I hadn’t considered that angle. That said, I still think you can construct many scenarios where your consent to prosecution as a victim are meaningless from a legal perspective.
For a closer example to the original consideration, assume a person that is abused by their spouse: There is a good reason why the abuse will be prosecuted regardless of that person's wishes if authorities are made aware of the abuse.
Legal perspective, yes. I'm mostly of the mind that law and reality are almost entirely disconnected with a very small contact patch. And that funnily enough contracts and contract breaches are on the side of reality until someone decides to take an argument to court.
For a closer example to the original consideration, assume a person that is abused by their spouse: There is a good reason why the abuse will be prosecuted regardless of that person's wishes if authorities are made aware of the abuse.