I personally find unseen UAV's raining missiles down on our heads to be much more terrifying. I'm actually quite excited about this tech. The first thing I thought when I saw this video was one of these things walking on the surface of Mars.
Agreed re: the UAV comment. Imagine a world where big brother is watching everything you do, and can kill you from the other side of the world with the press of a button, with absolutely no warning, with no way for you to defend yourself, and no way to attempt to explain your actions to someone.
A walking robot is much less terrifying.
The first thing I thought was that countries such as Cambodia could one day exist without landmines.