Are fears of violence causing schools to overreact?

Schools in Michigan have taken extraordinary steps in ensuring student safety since the Newtown tragedy. Over 30 schools in the state have shutdown schools for at least two days amidst fears of violence, student-led revolts, and doomsday predictions of a Mayan Apocalypse. Recently, a teenager at Millington High School was charged with a felony threat of terrorism charge for making threats against students and staff. Are these actions necessary or are school officials overreacting?