You know, every time there's a mass shooting in the US, a lot is made out of their big collection, but I always think about how you can only shoot one at once anyway, so it's actually a dumb thing to fixate on.
The real evil use would be telling nobody and becoming the world's best smuggler.
Also, would you leave a void in the water if you teleported out of it, or a big puddle in your cube going the other way?