Here is the opening line from approximately 9 out of 10 murder shows: "It was the kind of small town where nobody locks their doors."
Heads up: If you live in one of those towns, start locking your goddamn door. There are killers coming after you, and you would know it if you watched these shows. You don't, though, and that's why murder shows will never go away. For time eternal, people in towns with populations in the four-to-five digit range will always take the lack of hustle and bustle around them as a sign that they're safe from all of the horrors of "city life."
So people don't lock their doors and what happens? At some point, some random lunatic blows into town, walks through one of those readily available unlocked doors and just murders the s**t out of someone, usually a woman. It's so common among the stories featured on these shows that I'm genuinely surprised when I hear a news story about a serial killer terrorizing a major city, even if it went unspeakably well for Jason Voorhees.
Not to mention dozens of satisfied moviegoers.