I disagree with your robot sentiment - well, at least I don't think that's the solution yet. If a robot is going to be lethal you've got a whole host of problem

I disagree with your robot sentiment - well, at least I don't think that's the solution yet. If a robot is going to be lethal you've got a whole host of problems that you didn't have before (ie. Someone steals it and hacks it to terrorize) Also there are so many social queues in our day to day lives that are hard or potentially impossible for a robot to understand (at least with today's tech) - like someone jokingly saying "I'm gonna kill you!" to their friend. Once we get those problems figured out then sure, that's yet another job that we can automate.