Taiwan Woman Carries A HUGE WEAPON

I know recently murder took place at one of the train stations in Taiwan and I know everyone is scared. This Taiwanese lady must be scared to death because she was seen carrying such a big weapon for self defense.
But how did she pass through security? Won't other passengers be afraid of her? 

And this guy named John Iocchelli overreacted. Of course we all knew that there was a brutal attack. 4 people were stabbed to death and more than 20 people injured. It was not a laughing matter but what other facebook users pointed out were damn true.

The Taiwanese woman overreacted. And how can she be allowed to carry such weapon on board of a train? Why didn't security stop her? What if other passengers see and then the next day carry such weapons like her?

Drama in the train? More stabbing?