I don't fear them but I think it would be good for as many people as possible to agree on certain restrictions now or else we may have a serious problem in the future.
Certain governments are already researching how to use AI in war situations. There are ethical questions connected to Humans being killed by AI who chose to target them without a Human being involved.
That's just one example and there are many other ethical issues connected to AI.
@St0ut They will program it yes but not necessarily choose when to hit the fire button. Consider a swarm of drones coming over the horizon searching for the "enemy". That's not a pleasant thought.