If you feel something out of the ordinary in a low level or changing light area like an underground parking lot or a street during a power out it is possible to use a camera as a measure of self defense or confusion. Make sure the flash is on the highest output and there is no red eyes configuration and hold it ready at hand. This way if you are startled or feel something you can flash the camera and use this harmless device to escape or create a diversion. It can be also used as a part of an attack so mind if a person who looks safe asks you to look a certain way. Let your senses and feelings be your servants and avoid following politeness rules out of discomfort.
Consider what is important and what really makes sense.