1) There are an awful lot of relatively probable accidents that end with me dying in a hospital after a trip to the emergency room. I'd actually really like to see statistics on what percentage of people who die in each age group have their brains squished. 2) If you take FAI seriously, it may be worthwhile to attempt to preserve yourself regardless of what kind of shape you're in. I'm not certain a superinteligence could repair damage I can't even begin to imagine how to repair, but I'm not very confident it can't in many cases either.