Spring Arehart doesn't think about school shootings while walking around campus. That that needs to be said is troubling, actually. But it is true that the Hispanic music lover has chosen not to go to some concerts and festivals, out of concerns for her safety. "I don't think I'm going to be personally targeted," the University of Arizona graduate student says. "But if my chances in a mass shooting were one in 50 of being shot, I wouldn't want to risk being in that one.