As someone who makes his living filming EMS crews, I can say much of the advice you see here in this forum is spot on. Just focus on patient care and ignore the bystanders. The moment you try to censor a bystander, or journalist, you run the risk of making the scene into a spectacle that will almost certain find it's way (with emarassement to you and your agency) to the evening news, YouTube, you name it.
Historically speaking, when it comes to scene photos, etc., the most egregious acts of privacy violations have come from first responders themselves and not the general public or media.