It doesn't really matter, when we bear in mind that - if they DID operate in the fog and had a prang the same person would say "Why on earth did they operate? They knew it wasn't safe."
Many people think that automation can save the human race and there are countless examples - such as the company trying to sell CCTV monitoring software that can watch pax during the flight and determine 'suspicious behaviour'.
Some humans like to think that machines are the answer but the answer is that humans need humans!