in your reply you said a 'bag search', what would be the point of that when a small pistol/knife/grenade can easily be secreted on the body.
So what if the Malls have to hire additional security, they will build that cost into the rentals and the businesses add it onto the retail cost..don't you know!
Don't forget Thai society and poor parenting are to blame. The same parallel can be drawn with the results of the actions of Osama Bin Laden and the effect that had on world travel.