So why, you shout, shaking your bleeding hands at the sky, would anyone in the world design packaging that's impossible to open?
The Reason: Package Pilferage
To make it impossible to open.
More specifically, it's to thwart shoplifting, in particular, a very specific type of shoplifting. Package Pilferage describes a crime when small, relatively expensive objects are removed from their outside packaging (in which various anti-theft tags and devices are embedded) and stolen. By making packaging that's impossible to open with anything less than the Daikatana, product engineers have made shoplifting harder.
And easier to detect.