My family, all five of us, found ourselves staying in the heart of Rome over the Christmas holidays. I don’t know when I’ve ever seen more people jammed together in one place. As we snaked our way through crowds to see sights like the Vatican and the Coliseum, I repeatedly emphasized to my kids the practice of “situational awareness”—pay attention to where you are, who is around you, and what’s going on. We live in a day when the world, at home and abroad, isn’t a safe place. And with the use of cell phones and ear buds, kids (and…