End of the world and psychos

I drive my boys to the bus stop in the mornings because they can't seem to behave if I am not there and it is COLD the last few days. I can't sit there in my warm truck and look at those freezing kids, so I let them all pile in to stay warm. This morning the conversation turned to the topic of the Connecticut shooting and the Mayan calender end of the world thing. At least half of them are staying home from school on Friday because their parents are afraid that someone will freak out thinking it's the last day on earth and go shoot a bunch of kids at school. They went on to talk about the conversations they had had with their teachers about what would be done to keep them safe. It was all I could do not to cry. These are young kids, they should be thinking about their upcoming Christmas parties, not worrying that some psycho will come to school and try to kill them. I wish they could still be oblivious to all of this. I am really torn, I don't know if I should send them or not. I don't think anything like that would happen, but I am sure the parents of the kids killed last Friday didn't think anything would happen either. My kids all have Christmas parties that day, plus my youngest is trying for 100% attendance again this year. I guess I could go to school with them, but who's class do I go to? Plus I have a middle schooler who will be miles away from the elementary school. I am seriously considering keeping them home just for my own peace of mind. Thoughts?