I've not seen any follow up to this story (haven't really been looking). But I'm curious about how this went down.
Random knock on the door? Someone the victims knew?
I'm not overly paranoid; at least not in my own estimation. I live in a good area, on a quiet street without much traffic other then my neighbors and their guests. But I tend to keep a gun on my person until I go to bed. My doors are locked unless I or family members are out in the yard. And if I'm not expecting company, I make a point of being armed (and having one of the four legged family members nearby) before opening the door. And I've taken modest steps to strengthen the doors so it should take more than a single kick to get through them.
It is a terrible thing to have the sanctify of your home violated even when you are absent. I can't imagine the feeling of a home invasion while I'm there or my family being held hostage.