Well, it's a sad incident.
It makes me think twice like, I need to pack heat everywhere I go because you never know when someone is going to go psycho shooting spree, or maybe it's a thug with a gun who wants money, or a gangter trying to get some street cred by shooting a random person.
In this and many cases like it, you having a gun would not make any difference. If a thug approaches you with a loaded gun, you would not be able to get to your weapon and shoot him before he shoots you. Guns are part of the problem not the solution.