More guns would have fixed this. Think about it. Shooter shoots. People in crowd have guns pull theirs out. One person shoots the original shooter. Another person see's that person and thinks they are the shooter, and shoots them. So on and so on, because in reality, when there are tons of people panicking, the best thing is to have them all armed and out for themselves. It wouldn't end in a massacre of gun owners who all accidentally shot someone, naaaaaaa.