The U.S. border thugs plan to test patrols by robots on the border with Mexico.

A robot patroller can be programmed to be gentle and nonviolent. Or it can be programmed to kill or disappear anyone "unauthorized". It could even be programmed to flip from one to the other on command in an instant.

My conclusion is that there is good reason to be frightened of robot patrollers, because you can't start to predict what it will do to you 20 seconds from now.