samhain -- I have to respectfully disagree with you on two points. I wouldn't call early 20's college students "still adolescents developmentally". When are people old enough to be adults? Should we restrict military service, alcoholic beverages, and marriage to only those 25 or 30 years old?
As for trusting your safety only to a police officer, and not an armed civilian, that is your choice. One of my younger brothers is a police officer, and as he's said, the police will generally arrive from 5 to 20 minutes after they're called, depending how far away they are. In that first 5 to 20 minutes, the only people on the scene are the criminals, the victims, and the witnesses. I wish someone at Virginia Tech had chosen to be armed, and had fought back. Twice the police were called there, and 33 people, including the gunman, died anyway. I have a CCW, and although I rarely carry my Glock, after some sober reflection, I may carry it more often.
I do agree with you that now is the time to "grieve, hold our loved ones close and make big decisions when we have calmed down and thought things through."
Take care, and stay safe...