Care to introduce libel law into the discussion? A private individual vs a "public" individual there are different standards as to what is fair. That being said if you participate in a protest you are stepping into the public arena.
Originally Posted by 2F/2F
Again minding ones own business, sure you can snap a photo.... but continuing to do so, takes a step toward harassment, and depending on the use takes a step toward defamation and libel. Although I do not know a situation where a photograph has been considered libel... then again it used to be just professionals taking photographs for use in professional publications. Personal web-sites posting on facebook and blogs are a whole new arena.
If I were minding my business in a park, and as I take it one of you (cocky thugs with a camera) started photographing at length my families activities, you would be itching for a fight. I just heard a family of "dwarf people" who are sick of being photographed when in public, there is a point of just common human decency. I tried to photograph a women in her 90's that was a public fixture here in Indiana, she declined in a public place... nothing wrong with that, and I kept my honor in her memory. Having a camera does not exactly give you thugs the right to pursue, having a legitimate media credential might, that's all I have on the matter.