We must be sure that robot AI will make the right decisions, at least as often as humans do

Your autonomous vacuum cleaner cleans your floors and there is no great harm if it occasionally bounces into things or picks up a button or a scrap of paper with a phone number. But then again this latter case is irritating – it would be preferable if the machine was capable of noticing there was something written on it and alert you. A human cleaner would do that.