20 states legally allow CCW on campus
Note that 4 of 5 victims were under 21. That's another problem even with most of shall-issue states -- people under 21 have no legally recognized right to self-defense.
You said it, Oleg.
At 20, I can go to war and die for my country, vote for our next leaders, smoke myself to death, but can't have a handgun to defend myself with? Though I believe Indiana and a few other states do issue CCWs to people 18+