Well Mexico allows no guns and look cartels everywhere and a incompetent government and that dude in Norway who shot up a bunch of kids. Now look at switzerland everyone has to have a gun and every male has to serve in the military and there is almost no gun related crime.
Anyway what I'm trying to say is that there are too types of murders that crazy who guns down towns of people and those types of occurences are rare. If you were going to be murdered it would most likely be by someone you know. Like a jealous lover, your brother/sister, friend. Also most cops are incomptent, they seem to really good at pepper spraying protesters and writing traffic tickets, but they couldn't stop a killer if their lives depended on it.