There are some big veins and arteries running through there not too far from the surface. If your assailant gets one you are on a pretty quick trip to the morgue. As others have mentioned, sepsis is a real problem—if your intestines take a hit, the normally helpful bacteria in there can go straight into your bloodstream. That is a painful, nasty, and prolonged death.
All IKEA furniture uses Pozidriv (no “e”, it’s a trademark). Not going to say if that’s good or bad, but operating a Pozidriv with a Phillips is always going to be terrible.