Anti-gun law didn’t prevent tragedy
When are people going to start understanding that a law will be obeyed only if you choose to obey it. Just because you say “Make it so” doesn't mean it really is so. All that law did was create a killing zone.
And the other thing people need to understand is that the only way to stop a bad guy with a gun is a good guy with a gun. Had it not been for his stopping to reload (or the gun jammed — not sure which is the truth) he may have been able to go on to kill who knows how many more people.