In all honesty, I will say that it's a good thing that you or your family were not at home. If you had to defend yourself and truly take someones life, that would be the worst case scenario. I don't know if I could live with that, no matter how justified I was.
Be glad it was only possessions and you have insurance to cover it. The other good thing that is coming from this is that a lot of us, myself included, are thinking more seriously about home security and securing our guns and keeping them out of the hands of criminals.