Yesterday my son wondered why there was a police officer on duty at the church we attended. Today he overheard a video on Instagram referring to the tragedy in Las Vegas last night. On both occasions I had to tell my son that there are some bad people doing bad things in our world today. We are not even safe at church, perhaps less so, actually. It is so hard to have these conversations with my children. I want to shield them from the hard, scary realities of these times in which we live. But they need to know the…