I think the rate of accident taken place due to robots' replacement can be differentiated by the source of information. And when people in the situation where there is high possibility of accident, they can avoid and that action will decrease the damage of incident. But the robots which has error can't recognize the danger until the incident happen, so the damage will be more serious.   

Also I think the number of people who benefit from robotics is far less than that of the people who damage from robotics.