Being a former police officer, I have seen it a few times, I have even had to myself (at home, not just on the street). I am not a paranoid gun owner or anything, but I have enough training to know how to handle a firearm very well and will always have one close by. You do not always have to discharge your weapon, or kill someone to have used a firearm to protect yourself or your family either. And any time my family is safe when they otherwise might not have been is a very good cause, regardless of what I have to do to ensure it.