You always see it like this? If you're in a position to be filmed, you should accept being filmed no matter where, when or what consequences it may bring, as long it's legal?
Women being filmed in public restrooms comes to mind. It's their fault for being within public view?!
I'd also hate patients filming in hospitals for a chance of suing some doctor who makes a mistake as any human may. People make mistakes all the time, but some positions in society make these people far more vulnerable than others. Those positions may require a bit more protection.
Court rooms are protected from filming by law, aren't they?
There is a reasonable expectation of privacy in a restroom, even a public one. That is why there are walls, stalls, and restrictions on the gender who may enter. Depending on the nature of the filming and its distribution, the filmed person may have at least a civil claim against the filmer and the filmer may be subject to criminal liability.
A hospital is a business establishment that can prevent filming once you are on the hospital's property.
A court, subject to permissions and limitations set by statute or the higher courts in the jurisdicton can allow or restrict filming and put conditions on any filming it allows. Nevertheless, a court reporter is taking down every word on the record (and very possibly these days, the words are being recorded in audio format), so even a judge is leaving a record that can be scrutinized for abuse.
If a cop testifying at trial realizes that the court reporter is taking down his words (or even recording them in audio format) in the stressful situation of answering questions under cross examination from a defense attorney, is it the court reporter that "started it" if the cop gets up off the stand and confronts the court reporter? Should we not record the cop's testimony to make his job less stressful? Maybe let him testify via conference call from the beach?
A cop on a public street, while in plain view of a camera on the filmer's private property or while the filmer is on public property, has no reasonable expectation of privacy. In fact, in a growing number of jurisdictions, the cop is filmed and knows he is being filmed by a camera of his own patrol car.
And how are cops more vulnerable than anyone else? They are walking around with guns and the authority to arrest.