Hi, K.,
I'm so sorry that happened to your family. What a scary, scary thing to happen! Since you've had an alarm system installed, and I'm sure you've reassured the boys that they will be safe.......... I'm going to tell you what I would do in your situation, though I'm sure many moms are going to say I'm crazy or stupid or both. :)
I would, personally, change the way my children were looking at it. Of course they are the victims, but I think the feeling that you are the victim is what causes fear and insecurity. I would explain that what these people did was very bad, but perhaps they just didn't think they had a choice. Maybe they were just really poor and couldn't feed their children, and felt like they had to steal in order to get money. They were too ignorant to know that there is help available, and they did not have to do a bad thing, like taking someone else's property. I would try to get my children to feel sympathy for these people, and forgive them. And in that way, hopefully give back to my children a sense of power. It's up to them to forgive these people - they don't HAVE to give it, they are in control of whether they do or not. Like I said, it might help alleviate the feeling of being the victim, and make them feel more secure. Then, of course, I'd reiterate that just in case there are other people out there who think they have to steal, we have the alarm system in place so it can't happen ever again.
Just a different thought.....
Blessings to you and your family. I hope you all find peace again soon.
J.