all good advice and ideas and suggestions. But mostly useless in my opinion. If you are going to a dangerous place, have insurance, and be prepared to lose your stuff.
But like some others have mentioned, if it's big and has a shiny screen on the back be prepared to let it go. Some places I have been to, they will take your p&s.
In my experience, carry your camera in an old beat up backpack, bring one lens, batteries and cards. A pack with easy in and out access is ideal. Frame the shot in your mind, consider all settings, pull out the camera, set it up, take the shot, stuff the camera in the bag and walk away.
I have had to run from thugs until I found cops. They turned away as soon as I got next to the cops. Closest call I've had.