Technologists need to understand the society in which they live, and the effect their inventions could have on it.
It won't be like an army of robots marching in the streets, but AI hacking is on the horizon.
The unexpected behaviour of even simple bots is only going to get more dramatic as AI scales up.
Treaties banning biological and chemical weapons are in place, and the path is clear to remove nuclear weapons too. Lethal autonomous weapons (killer robots) should be next.