That just means we need MORE gun control, according to gun grabbers. Just like how the Charlie Hebdo shooting or all the other mass shootings in France were prevented by their draconian gun laws.
Most places that require a fee for entry, like music festivals, outlaw people from carrying guns into the festival. So anyone who brings a gun in to kill a lot of people basically has a bunch of defenseless sheep (disarmed by law) to slaughter until the police arrive 15-30 minutes later.
Thank you gun control!
It reminds me of Luby's shooting.
https://en.wikipedia.org/wiki/Luby's_shooting
A lady present who watched her parents get murdered in front of her own eyes, says she would have carried a gun to defend herself but she had to leave it in her car or she'd be committing a felony.