I definitely trust my daughters to know whether or not they are comfortable in a particular situation. In fact, if I think something would be great fun for one of my daughters but she says she would rather not do it, or go to a particular place, for any reason, I respect her feelings; I don't push my children into any situations where they're not comfortable. I also don't make them spend time with people who they're not comfortable with.
This doesn't mean that I encourage them to call the police every time they feel uncomfortable.
Children definitely need to know how to dial 911 so that they can contact the police/medical authorities in the event that a crisis occurrs where an adult is not available.
But, where an adult is available -- and if I'm sending my child somewhere on her own with a cell phone (I don't actually do that yet, but my girls are younger), you can bet that this means that either dh or I is accessible by phone -- to me, it just seems natural to use a parent as a sounding-board on how to handle uncomfortable situations. This wasn't a life and death emergency (obviously, if someone's bleeding profusely, you need to alert others around you, namely a lifeguard, as well as calling 911, rather than calling Mom or Dad who wouldn't be able to get there fast enough).
Children should absolutely be heard! I just tend to see a parent as the first logical choice of someone to turn to.
Also, about cases where my child's butt-cheek might get inadvertently exposed at the pool, and someone might snap a photo and post it on the Internet -- if my child isn't recognizable, I don't care. If my child IS regognizable, I'll alert the authorities. There are laws against publishing recognizable photos of children without parental permission.
But honestly, if I don't know about it, I don't know about it and what's the big deal? How does it affect us? I agree with Choli that it's not my actual child in that photo; her soul has not been stolen.