There are smart criminals and dumb criminals, and you know for a fact anybody holding up families in a robbery attempt is way down on the idiot end of the scale--that's just not the way to make money, even if you have no morals and are willing to risk your life and freedom for it.
So, as hard to believe as this is, I'd be willing to buy it. Too bad they're not eligible for a Darwin Award, as deserving as they are.