Digital etiquette

Two scenarios. There's a car crash outside my temporary accomodation. Two cars are written off, and one or more drivers are in the back of an ambulance. Is it okay it take pictures? Is it right to tell off neighbours for collecting photos?

Meanwhile in cyberspace, a yahoo messenger contact - who I've never met in person - announces on her blog that her 'cancer is moving very quickly and I chose not to have any more treatments'. What's an acceptable way to respond, that doesn't include forgone conclusions about her health?

Dilemmas of the digital age.