What? Next you are going to tell me I should have smoke detectors and fire extinguishers in my house aren't you?
edit: that was sarcasm. Unless you are one of the "shoot 'em in the dark without identifying them first" group, then there is zero chance you will need to know first aid for gunshot wounds on loved ones.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.