Making something much smarter than you is one of the few ways to actually get killed off without a second chance. None of the other things on your list can kill

Making something much smarter than you is one of the few ways to actually get killed off without a second chance. None of the other things on your list can kill everyone. Do we know we'll be making something much smarter than us? Not right now, no. But if we were going to the risks would be high.