I just love Monday morning quarterbacks. Regarding the Virginia Tech incident: "They should have closed the campus."
How do you really close a 2,000-acre campus? What do you do when a fellow student (suspect) wants to get in a building? If you lock everybody out and suspect shoots them outside, you are then accused of leaving them out to be slaughtered.
Bad things happen in this world. Get over it. There's nothing you can really do about it.