From one of the network programmers:
I think there's a cathartic journey that the audience goes on that in the end makes you feel somehow safer. It's counterintuitive, but when the handcuffs are on, justice is served and the perpetrator is behind bars and you see these real people getting on with their lives you kind of feel like 'okay I can go to bed and I’m not going to check my door ten times'...(Via Ryan Sager.)