Who Said They Had to be Mass?
Student at D.C. Excel Institute shoots two, steals cars, police say
FAU shooting has campus in lockdown, classes canceled
Since these shootings were relatively low-profile (IE, no blood on the ground, no police running to the scene, no bodies), they don't receive as much attention as Northern Illinois University or Virginia Tech, just like the shooting by a female of classmates at a Louisiana technical college wasn't heavily covered.
But even these small incidents of crime support lawful concealed carry on college campuses. Citizens don't go armed in preparation for a mass shooting. The majority of defensive gun uses are individual encounters with robbers and attackers.