We had some serious murders near where I live in 1999, where a woman, her two children, and her elderly mother were murdered. I can tell you it came as a very bad shock to us in the Village. More importantly, some people were very frightened by the incident and it affected their way of life for a long time after.
At the time, I used to do some voluntary work amongst OAPs and I used to visit an old lady twice a week and take her shopping in my car. But she refused to go out on her own for months after the murders, even after the perpetrator was arrested.
Nobody expects this sort of thing near where they live, especially if its a peaceful ex-Pit village like mine.