That is fine if someone wants to hide behind some shelves or what have you. I took an oath to protect my fellow Americans from threats both foreign and domestic. Some of us take our commitment seriously. Though I suppose I can't expect too much from the common civilian. I hope my LEOS and Millitary brothers would do the same. With that being said I also have the training that the common civilian doesn't have. Still if I was only a common civilian I believe I would still help those in harms way instead of hiding. Given that my actions wouldn't make the situation worst of course.